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UPDATE.DOC, ARJ 2.55b ALPHA TEST July 1996 This documents new or updated information since ARJ 2.50. ** IMPORTANT NEWS **************************************************** *** THIS VERSION OF ARJ IS THE SECOND PUBLIC ALPHA TEST RELEASE. *** A few bugs have been fixed. See WHATSNEW.DOC for details. This is a test release with new features which may be changed in the final release. The purpose of this release is to gather comment on the design of the new features and to find program bugs. We welcome any suggestions or bug reports that you might have to improve upon this version of ARJ. The most likely areas of bugs involve handling filenames longer than 80 characters and using XMS memory to handle a large number of filenames. DO NOT USE THIS TEST VERSION OF ARJ AFTER DECEMBER 1996. Look for an official release of ARJ then. There is NO expiration timer in this program. The time limit is for your protection and is strictly voluntary. You should not use a test version of any software for too long. The mailing address of ARJ Software has changed as of August 1993. ARJ Software Robert and Susan Jung P.O. Box 249 Norwood MA 02062 USA FAX: 617-769-4893 EMAIL: robjung@world.std.com There is ARJ Internet mailing list and WEB site support information added to the file ARJ.DOC. --------- This version of ARJ will use more conventional memory than previous versions of ARJ. However, using the "-hm1" or "-hm!" option will reduce your memory requirements especially when archiving a large number of files. --------- After ARJ version 2.41a, full functionality of certain ARJ software features will NOT be available in the shareware versions of ARJ (registered or not). These features include the multiple volume self-extractor, the ARJSFX embedded command line feature, and the inhibit display messages option. The full featured versions will ONLY be available from ARJ Software and its agents. Registered ARJ users can upgrade to this version for a small shipping/handling fee ($5) or a SASE with diskette. For credit card users, the upgrade fee will be $10 because of minimum fee charge requirements. Check the WHATSNEW.DOC file for changes since ARJ 2.41a. --------- ** THIS VERSION OF ARJ HAS LONG FILENAME SUPPORT UNDER WINDOWS 95. --------- This version now supports ARJ-SECURITY for multiple volume archives and multiple volume self-extractors. --------- New to this version of ARJ is a data damage protection option. A slightly damaged/corrupted ARJ file can be repaired if the archive was protected by creating a data protection file before the damage occurred. See below for more information. --------- New to this version of ARJ is the concept of backup CHAPTERS. This allows the user to do MULTIPLE full backups to a SINGLE archive in such a manner as to allow the full restoration of the files at the time of ANY of the backups (CHAPTERS). This allows the user to backtrack easily, a feature valuable to software developers. Deleted files are also accounted for in this chapter scheme. To go along with the new CHAPTER feature, ARJ now fully supports the UPDATE of multiple volume archives. To implement this feature reliably in multiple volumes, all new or changed files are added at the END of the LAST volume. This re-arrangement only occurs with multiple volume archives. This prevents the diskette overflow that would occur with earlier versions of ARJ. Because of the new CHAPTER feature, ARJ NO LONGER SUPPORTS the old ARJ backup file feature. This is the old "-jb / -jg" functionality. This version of ARJ will not process this type of archive properly. See the "ac" command and "-jb" option for more information about CHAPTER archives. --------- New to this version is the "hollow" archive. This is an ARJ archive that does NOT contain the compressed file data. The main application for this kind of archive is scanning for CHANGED files. This makes the hollow archive useful for file integrity scanning as in virus damage scanning. --------- This version of ARJ provides a new encryption scheme based upon the Russian encryption algorithm (GOST 28147-89 cipher). This algorithm is similar in design to DES; however, GOST is designed for software implementation. This implementation uses the 64 bit cipher feedback mode. This new encryption is accessed by using the "-g" option to specify the password and the "-hg" option to specify the new scheme. This new scheme is in addition to the older XOR garble scheme. ** Please NOTE that losing your password means losing your file! ** Please do NOT ask for technical support on lost passwords. ** There is no shortcut/backdoor for determining lost passwords. The encryption module is a separate COM file named ARJCRYPT.COM. ARJ expects to find the encryption module in the same directory as itself. ARJ treats the COM file as an overlay type module. This has the advantage of saving space with the ARJSFXV module and the DEARJ.EXE module when encryption is not needed. You simply do not include the encryption module in the archive. For non-USA users, the encryption overlay module is not included with this version of ARJ. Because of USA export regulations, the encryption overlay module may not be exported from the USA. --------- ARJ can archive up to 32,000 files at one time when the "-hm" option is specified. This option enables ARJ to use disk space instead of memory space to manage the names of the files being archived. The "-hm!" option uses XMS memory to manage the list of names. At this revision of ARJ, checking for duplicates is NOT disabled as it was in 2.50. --------- The multiple volume SELF-EXTRACTION FUNCTION is LIMITED in the ARJ shareware version. Only volumes of 360K or less in size can be created AND only such volumes will be processed by the self-extractor. This feature is accessed through the "-je" option along with the "-v" option. This multiple volume self-extractor supports ANSI escape sequence displays. It also supports ARJ-SECURE over multiple volumes and the new encryption method. --------- The extraction "-jo" option now works in cooperation with the "-f" and "-u" type options. Previously, the "-jo" option disabled the "-f" and "-u" options. --------- The "-g" option will NOW force compression even when a size increase results except when the "-m0" option is used. Encrypted compressed data is more secure than encrypted stored (-m0) data. --------- This version no longer detects the older 2.30 ARJ-SECURE archives. --------- ** CAUTIONS ** Whenever archiving to diskettes, it is HIGHLY recommended that the option "-jt" be used. This helps spot BAD diskettes or BAD diskette drives. It is HIGHLY recommended that the "-jt" option be used in a Windows or multi-tasking or network environment. UNERASE or UNDELETE commands do not always recover a file correctly. This will result in damaged archives. This is true for all archive types. You should always test an archive after unerasing it. CAUTION: To those who use the "-t1" and/or "-t1g" options to save a few extra bytes. This option should only be used on TEXT FILES. Those are files created by EDLIN, EDIT, QEDIT, BRIEF, NOTEPAD, and others. Text files typically contain only letters, numbers, spaces, and punctuation marks. WORD PROCESSOR format files ARE NOT TEXT FILES! MS WORD, Wordperfect, AMIPRO, WRITE, and similar files ARE NOT TEXT FILES. Using the "-t1" or "-t1g" on any other kind of file probably will result in DATA LOSS! ********************************************************************** WINDOWS 95 LONG FILENAME SUPPORT This version of ARJ supports the use of long filenames under the Windows 95 in the MS-DOS Prompt environment. It does not support long filenames under MS-DOS 6.22 and below. It supports long filenames ONLY when the Windows 95 GUI (graphical user interface) is running. In other words, there is no long filename support in Windows 95 MS-DOS mode (accessed from the Win95 shutdown menu). The small ARJ self-extractor (-je1) does NOT support the handling of long filenames. The ARJSFX and ARJSFXV modules (-je) support long filename handling. However, they will only extract archived Win95 long filename files under Win95. If long filename files are being extracted to plain DOS, an error message will be displayed. They can be forced to extract the Win95 archived files with the "-j" option. For compatibility with MS-DOS and older versions of ARJ, ARJ can create a dual-name compatibility ARJ archive. This is an archive with both shortnames and longnames stored in it. The longnames are stored in the file comment field. New versions of ARJ will treat the dual-name archive according to the operating system environment. In other words, under MS-DOS, a dual-name archive will look like a shortname archive. Under WIN95, a dual-name archive will look like a longname archive. This is also true of the ARJSFX and ARJSFXV modules (-je). For efficiency reasons ARJ does not repeatedly check for file system support of long filenames. ARJ only tests the "C:" file system. An error may occur if ARJ under Win95 tries to access a disk drive that does not support long filename handling. The "-hf" option can be used to force ARJ to use the standard 8.3 filename APIs instead of the longname APIs. There are three new options "-hf", "-hf1", and "-hf2" that provide choices in the handling of long filenames. See the discussion of those options below for more information. ARJ will save Win95 long filenames in the letter case they are stored on disk; however, all filename matching is done without regard to case. In other words, "ThisName.Ext" matches "thisNAME.ext". When archiving files under Windows 95, be sure to EXCLUDE files from processing that are OPEN such as WIN386.SWP. ARJ RESPONSE FILE PROCESSING: ARJ will accept an ARJ command line from a response file as in "ARJ @command.rsp". The "@" symbol indicates that the appended name is the name of the response file. In this case, the file is command.rsp. The response file symbol cannot be changed. The response file should contain the ARJ command line minus the initial "ARJ". The command line may be split over as many lines as necessary. The response file feature will NOT accept QUOTED command line options. Options with embedded blanks ("-vasTEST X") will not be processed as expected. See the "-@" option for help on options with blanks. When using the response file feature, ARJ will accept only the "-+", and "-&" switch options on the DOS command line along with the response file name. All other command options must be specified in the response file or in the ARJ environment variable. To better support long filenames, ARJ provides the "-@" option to handle the processing of filenames and switch options that contain embedded spaces. The "-@" switch option enables the interpretation of a text line in an ARJ response file as a single token. In other words, when ARJ scans an "-@" option, it will process the NEXT text line in the response file as a single token including all embedded, leading, and trailing blanks. ARJ will continue to process each subsequent text line in the same manner. If ARJ scans a subsequent "-@" option, ARJ will revert to its normal multiple tokens per line processing. ARJ-PROTECT DATA PROTECTION FEATURE With this version, ARJ can repair "protected" archives that suffer from slight amounts of data damage (CRC error, bad header, etc). An ARJ archive is "protected" with the "-hk" option. With the "-hk" option, ARJ will generate a separate ARJ data protection file. This protection file is REQUIRED in order to repair damaged ARJ archives. The size of this file ranges from a minimum of 4096 bytes and upwards. For larger archives, the protection file size is typically less than one percent of the archive file size. For this release, the protection file is a separate file. This avoids the problem of uploading unnecessary data to BBSes and ftp sites. The name of the protection file is based upon the archive name plus the extension ".XRJ". Volume protection files end in ".X01", etc. This protection feature is sector based and allows repair due to typical types of disk corruption (bad sector, virus damage, cross links, etc). This type of sector protection is NOT effective for most data transmission problems where data is missing from the middle of a transmission. Technically, this protection feature uses a series of XOR sums and checksums in order to allow repairs. Larger archives are logically treated as separate streams of data. ARJ can protect each "stream" from one or two damaged sections 1024 bytes in size. However, for large archives (1 MB or larger) ARJ can sometimes repair up to four damaged sections per MByte. The "-hk1, "-hk2" ... "-hk9" options can offer more data protection at the cost of a proportionately larger protection file. The "-hk" option sets ARJ to build a protection file. The "q" command is used to repair a damaged archive. The repaired archive is named ARJFIXED.ARJ. Example: ARJ a archive -hk generates archive.xrj ARJ q archive repairs archive.arj ARJ ANSI COMMENT HANDLING At version 2.55, ARJ will use its own ANSI sequence display handler to display ARJ comments. In previous versions, ARJ depended upon the "-ja" option and an installed ANSI.SYS driver to handle the ANSI escape sequences. The "-ja" option has a new function now. The "-ja" option will set the "P" command to display files using the new ANSI sequence display handler. The ARJSFXV module (-je -v) also will display ANSI comments now. Please note that the ARJ comment field size is limited to about 2K bytes. ARJSFXV MULTIPLE VOLUME SELF-EXTRACTOR This module now supports ARJ-SECURE and ANSI escape sequences in the archive comment. You can build a single volume self-extracting archive by specifying a larger volume size. The ARJ distribution archive uses the ARJSFXV module because of the ANSI comment support. Example: ARJ a archive *.* -je -v300K ARJ COMMANDS "ac" command This is a new two character command for ARJ. It is actually an abbreviation for the following command and switch options: "u -u2 -jb". The "ac" command will add a chapter backup to a new archive or add a new chapter (updating) to a chapter archive. Example: ARJ ac archive c:\dir\*.* -r -jt The advantage of a chapter archive is that you can make numerous full backups (chapters) to a SINGLE archive. Major space savings will result when some files do not change from backup to backup. See the "-jb" option for more details. "e" command "x" command Chapter archives do NOT support extraction with deletion. ARJ x archive *.doc -d generates "Bad command syntax" "q" command The "q" command is used to repair a damaged "protected" archive. An archive is protected with the "-hk" option. Both the protected archive and its ARJ-PROTECT data protection file are required to repair any damage. The "q" command will attempt to repair all damages and put the repaired archive in a file named ARJFIXED.ARJ. Example: ARJ q archive When working with a damaged archive and the "Abort, Retry, Ignore, Fail" prompt appears, you should select the "Ignore" option. "y" command When used with the "-g" option and optionally the "-hg" option, ARJ will ungarble a previously garbled archive. Example: ARJ y archive -gpasswrd When used with the "-jb" option, ARJ will convert a standard archive to a chapter archive. Example: ARJ y archive -jb When used with the "-jb*" option, ARJ will convert a chapter archive to a standard archive. Example: ARJ y archive -jb* ARJ SWITCHES "-@" switch This switch sets ARJ to enable/disable the interpretation of text lines in an ARJ RESPONSE file as a complete single token. Normally, in an ARJ response file, blanks are interpreted as token separators. (Tokens are commands, filenames, wildcards, and switch options). However, if ARJ scans an "-@" option in a response file, it will process subsequent text lines as single tokens per line. A subsequent "-@" option will revert ARJ to normal multiple tokens per line mode. Example: ARJ @text.rsp TEXT.RSP contains: a c:\dir\archive -r -jt1 -@ -a1 c:\long directory name\*.* c:\other directory name\*.* -@ dir1\*.* dir2\*.* dir3\*.* One common error when using the "-@" option is including extraneous leading and/or trailing blanks. For example, ARJ will abort with an invalid switch option error if the second "-@" above has one or more trailing blanks. "-b" switch Under Windows 95, the use of the "-b" type switch options to reset the archive bit may result in a sharing violation error. Under ARJ 2.55b, ARJ will display the error and then proceed ignoring the error. "-e" switch This switch used during extraction will exclude the beginning characters of the filename. This can be useful for shortening a long output pathname. Examples: ARJ x archive -e10 will exclude the first 10 characters of the output filename. ARJ x archive -e4 will exclude the first 4 characters. "-f1" switch This switch is used to select files that are OLDER for extracting or adding. "-f2" switch This switch is used to select files that are DIFFERENT (different date-time or different size) for extracting or adding. There is a slight limitation to this switch. When processing files that are split across volumes, the size test is skipped. "-g" switch The garble option in this version of ARJ has two versions. One is the original version found in earlier ARJ releases. It is compatible with older versions and works like those versions. The other garble version uses a separate encryption module. ARJ treats this module as an overlay. This new option is accessed by using the new "-hg" option. This option sets ARJ to use the separate encryption module to encrypt the data. By default, ARJ will look for the file "ARJCRYPT.COM" in the same directory where the ARJ.EXE being executed is found. The user may specify the pathname of the module to use. Examples: ARJ a archive *.doc -gThis_is_a_password -hg ARJ a archive *.doc -gpassword -hgc:\dir\enc.com The new garble option accepts a password key up to 32 characters long. Excess characters are ignored. Garble passwords ARE CASE SENSITIVE! DO NOT LOSE your password! There is no known method to recover the password other than by brute force, which could take a very long time. The longer the password, the longer it would take to "guess" it. This new encryption scheme is not compatible with the "-g" option of pre-2.55 versions of ARJ. If you want to maintain compatibility with pre-2.55 versions of ARJ, you should NOT use the "-hg" option. Only the multiple volume self-extractor supports the new encryption module. When garbling or ungarbling an existing archive, ARJ will detect the method of encryption previously used and select that same method even if the "-hg" option was not specified. "-s3" switch This switch sets ARJ to keep both the original archive file time-stamp as well as the original internal archive modified time-stamp when modifying the archive. This feature is helpful when adding a copy of the data damage protection file to the "protected" archive. Using this switch, you can add a file to an archive and then remove that file and end up with the original archive. This is necessary because any change in archive contents would be perceived as damage by the ARJ "q" (repair archive) command. Example: ARJ a archive *.doc -hk ARJ a archive archive.xrj -s3 ARJ e archive archive.xrj -d -s3 ARJ q archive The above sequence of commands replicates a situation where the user embeds a copy of the data damage protection file into the "protected" archive. In the case of slight archive damage, the protection file can be extracted and used to recover damaged data. "-u1" switch This switch is used to select files that are OLDER or NEW for extracting or adding. "-u2" switch This switch is used to select files that are DIFFERENT (different date-time or different size) or NEW for extracting or adding. There is a slight limitation to this switch. When processing files that are split across volumes, the size test is skipped. "-v" switch For specifying sizes for this option, ARJ will accept the "M" modifier to multiply by 1,000,000 (one million). Examples: ARJ a vol -v100M ARJ a vol -vr1M1440 "-hf" switch This switch disables Windows 95 long filename handling. ARJ will use the standard DOS 8.3 APIs to do its processing. Files so archived with this switch can be extracted under Windows 95 and DOS. This switch can be used while listing a dual-name archive under Win95 to list/process the shortnames. "-hf1" switch This switch in Win95 during archival sets ARJ to build a dual-name compatibility archive by storing the shortname in the filename field and the longname in the file comment field, so that both long filenames and short filenames are stored in the archive. Such a dual-name archive is compatible with older versions of ARJ. New versions of ARJ process such an archive according to the current operating system environment. Under Win95, the long filenames in the archive are used. Under MS-DOS, the short filenames are used. This processing is automatic for this release of ARJ. The "-e1" option does not affect the short name that is stored. This switch during extraction in an environment where long filenames are not supported sets ARJ to extract files using generated names. ARJ will generate a short name based upon "W95LNAME.000" and its sequence number in the archive. "-hf2" switch This switch sets ARJ to attempt to extract using the long filenames stored in the archive. No modification is done to the long filenames except by DOS itself. This switch also sets ARJ to use the standard DOS 8.3 APIs for processing. Because of the shortening of the filenames by DOS, duplicate filenames may result. "-hg" switch This switch is used to specify the filename of the encryption module to be used when encrypting a new archive. The default filename is "ARJCRYPT.COM". ARJCRYPT.COM contains a new encryption scheme that is incompatible with earlier releases of ARJ. ARJ will look for the encryption module in the directory that contains the copy ARJ.EXE that is being executed unless the specified module name contains a path symbol "\" as in "ARJ\OLDCRYPT.COM". If you want to use a module in the current directory, you should specify the name as in ".\ARJCRYPT.COM". The "." indicates the current directory. With an existing archive, ARJ detects the encryption scheme that was used to encrypt the archive and uses the same scheme regardless of whether the "-hg" option is specified or not. "-hk" switch The "-hk" switch sets ARJ to create an ARJ-PROTECT data protection file. This file is named similarly to the created archive except for an "X" in the beginning of the file extension as in NAME.XRJ. This ARJ-PROTECT file contains necessary information to repair damage to the original archive. The "-hk1", "-hk2" ... "-hk9" options will generate larger ARJ-PROTECT files affording a higher probability of a successful repair. For users who do not like the separate protection file feature, there is a work-around. Using the new "-s3" option (keep original time-stamps), the user can add the ARJ-PROTECT file to the protected archive and extract it later for repair purposes. Example: ARJ a docs *.txt -hk builds protected archive ARJ a docs docs.xrj -s3 inserts protect file ARJ e docs docs.xrj -s3 -d extracts and removes protect file restoring the original archive ARJ q docs repairs archive "-hm" switch The "-hm" switch sets ARJ to transfer the list of filenames to be archived from the limited conventional memory to file storage. This allows a much larger number of files to be processed (over 32,000). This option is ignored for all ARJ commands except "a", "f", "j", "m", "u". Normally, this switch sets ARJ to wait until it is out of memory storing filenames into a list before transferring that list to a temporary file. That temporary file is put in the current directory or the special work directory if specified (-hm!F:\) or XMS memory is specified (-hm!). However, there may be a few cases where ARJ will run out of memory doing other tasks while it is storing this list. In these cases, ARJ will abort. The user can specify a numeric argument of "1" to this switch to force ARJ to transfer the list to file storage immediately. The "-hm" work directory is specified by appending a "!" to the "-hm" or "-hm1" options and then appending the filename to the option. See below. Examples: ARJ a archive c:\*.* -r -hm ARJ a archive c:\*.* -r -hm1 ARJ a a:archive c:\*.* -r -va -hm500!F:\ ARJ a a:archive c:\*.* -r -hm!G:\temp\ The use of a RAMDISK directory will provide the fastest operation. "-hm!" switch The "-hm!" option with no pathname appended to it will set ARJ to store its list of filenames in XMS memory. List processing will be faster using XMS memory as opposed to using disk space. If no XMS memory is available, ARJ will use conventional memory and then disk space if needed. If there is not enough XMS memory for available for the internal list, ARJ will abort. "-j#" switch This switch allows the building and testing of a special ARJ "HOLLOW" archive that is missing the actual compressed file contents. This allows the creation of small archives for CRC testing against the CRCs of actual files. This is suited for special applications. Please take note that NO actual file data can be extracted from these "HOLLOW" archives. For example, a user has transported a directory of files from one PC to another PC. At a later time, that user would like to determine which files have actually changed their contents regardless of the date-time stamps. That user could archive the original directory using the -j# switch which builds the ARJ "hollow" archive with the sole exception that no compressed data is stored with the archive. This allows the rapid building of a much smaller archive. The file CRC is computed and stored in the archive. This new "hollow" archive is transported to the other PC. A simple ARJ test command with the "-jt1" option on the other PC would point out files whose content's CRC do not match. Another use of this "hollow" archive is for FILE INTEGRITY checking. You can create this "hollow" CRC archive and use it at a later time to determine if any files have been corrupted or damaged by VIRUS or system problems. Please note that there is a VERY SMALL possibility that a file has been changed and its new 32 bit CRC still matches. That possibility is approximately one in four billion. The -j# option during an ARJ archive build will set the compression method to 9. The only change is that the file header will indicate that the compressed file size is ZERO. Otherwise, the file header is the same as in an archive where the file was actually compressed and stored. To use this "hollow" archive to test CRCs against actual file CRCs, use the following syntax: Syntax: ARJ t archive_name -jt1 ARJ t archive_name target_dir\ -jt1 The second command above is used where the relative pathnames stored in the archive do not match up with the current directory. See the discussion in ARJ.DOC for more information on the option "-jt". When ARJ displays "NOT matched" for a "hollow" archive, it means the file size in the archive and the size of the actual file do NOT match. "-ja" switch This switch has acquired NEW functionality. Its OLD function was to set ARJ to fully display ANSI escape sequences. It now is used with the "ARJ p" command to display files using ARJ's own ANSI display handler. ANSI.SYS is no longer needed. Example: ARJ p ansifile -ja -q "-jb" switch This switch sets ARJ to build a chapter archive. Once an archive is set to a chapter archive, all subsequent processing will continue to treat it as a chapter archive. The advantage of a chapter archive over a series of separate archives of the same set of files is that space can be saved when archived files do not change. A single chapter archive can produce the same results as one hundred standard archive backups. In other words, one can update a chapter archive one hundred times and fully recover any one of those updates. Technically speaking, each file in a chapter archive has a chapter lifespan range. When a file is backed up and has not changed since the last backup, only the lifespan range is changed. A copy of the file is NOT added to the archive since a copy already exists in the archive. If the backed up file is different from the previous version, then that file is added to the archive with an appropriate chapter range. The previous version of the file is still kept in the chapter archive. When a particular chapter is restored, ARJ selects only the files whose lifespan includes the chapter number requested. As an example, suppose one made a series of daily chapter backups of a document directory where only one document out of the one hundred documents changes on a daily basis. The chapter archive would contain the original one hundred documents plus a copy of each day's changed document. When processing chapter archives, all ARJ add type commands (A,M,F,U) will create a new chapter in the chapter archive. Up to a maximum of 250 chapters can be stored in a single archive. The proper way to build and update a chapter archive is with the "ac" command. You should use the same command line arguments for each chapter update. If you fail to select the same files as before, the chapter archive will not update the lifespan ranges properly and those unselected files will "appear" to have been deleted for the current chapter. By default, the "ac" command will update a chapter archive with files that are DIFFERENT from the previous chapter (different size or date-time stamp). The "ac" command is actually an abbreviation for the following command and options: "u -u2 -jb", so you CANNOT use the "-u" or "-jb" options with the "ac" command. ARJ ac archive dir\ *.txt *.doc *.wri initial build ARJ ac archive dir\ *.txt *.doc *.wri second chapter ARJ ac archive dir\ *.txt *.doc *.wri third chapter ARJ ac archive dir\ *.txt *.doc *.wri fourth chapter ARJ ac archive dir\ *.txt *.doc fifth chapter will be missing all *.wri files An expert with ARJ may want to use the actual commands and switches instead of the "ac" command. ARJ u -u2 -jb archive dir\ *.txt The "-jb$" option will allow ARJ add type commands to update/replace files in the most recent chapter in the archive. This option can be used to "fix" a chapter where files are missing. Be careful doing this. It is much simpler and safer to add a new chapter to the archive. ARJ a archive -jb$ dir\ *.wri It is possible to change a standard ARJ archive to a chapter archive with the "y" command and the "-jb" option. The opposite is possible with the "-jb*" option. ARJ y archive -jb converts archive to chapter archive ARJ y archive -jb* converts chapter archive to standard archive You can restore the files in the most recent chapter as in: ARJ x archive You can restore a specific chapter as in: ARJ x archive -jb10 restores chapter 10 ARJ x archive -jb20 restores chapter 20 You can list a specific chapter as in: ARJ l archive -jb10 lists chapter 10 ARJ l archive lists the most recent chapter You can see the chapter ranges for each file in the archive with the following command: ARJ l archive -jb* -jv To start all over again with a chapter archive, you should purge all of the previous chapters, convert the archive to a standard archive, and then back to an archive chapter. You cannot modify specific chapters other than the most recent chapter. You can remove the most recent chapter with the following command: ARJ d archive *.* -jb If you do not specify the "-jb" with a delete command, the archive chapter header will not be deleted. "-jb*" switch This switch is used to select all chapters. When it is used with the LIST command, ARJ displays all chapters. ARJ l archive -jb* displays all chapters This switch can be used with the DELETE command to remove all chapters of selected file(s). ARJ d archive -jb* *.bak *.tmp This switch is also used with the "y" command to convert a standard archive to a chapter archive. ARJ y archive -jb* converts chapter archive to standard archive "-jb$" switch This switch can be used with the ADD command to modify the most recent chapter files. ARJ a archive -jb$ dir\ *.wri This switch can be used with the DELETE command to purge all BUT the current chapter. ARJ d archive -jb$ *.* is the same as ARJ k archive *.* "-jo" switch New to this release, the "-jo" option during extraction works along with the "-f" and "-u" type options. In other words, if you want to freshen a set of files from an archive, the use of the "-jo" option will generate unique names for any files extracted. Example: ARJ x archive *.* -u -jo "-jyv" switch As a clarification of older documentation, the "-jyv" option will disable the next volume prompt EVEN with removable media. The global "-y" option does not disable the next volume prompt with removable media. end document