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1992-11-22
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UPDATE.DOC, ARJ 2.39b November 1992
This documents new or updated information since ARJ 2.30.
** IMPORTANT NEWS ****************************************************
ARJ 2.39b transitions to a NEW SECURITY ENVELOPE scheme. However,
this version WILL NOT create security envelopes.
The previous ARJ beta, 2.39a, would not compress a few files
correctly. You should always use the "-jt" option with ARJ
betas.
ARJ 2.39b has improved speed in compression and decompression
over ARJ 2.30. It uses a modification of the method 3
compressor to save memory and achieve more speed.
The self-extractor modules have been changed significantly. The
large ARJSFX module will NOT prompt for permission to continue
the extraction if the "-e", "-x" or "-y" arguments have been
specified. The small ARJSFXJR module will NOT count the skipping
of files that already exist as major errors. This ARJSFXJR
skipping will generate a DOS errorlevel of 1, while other errors
will generate a DOS errorlevel of 2.
ARJ 2.39b can NOT be register stamped.
To prevent novices from using ARJ to update a multiple volume
archive, ARJ will not allow a multiple volume update unless the
new "-hu" option has been specified.
The "-y" option no longers suppresses the multiple volume prompt
when the volume resides on a removable media drive such as a
diskette drive. You can suppress the volume prompt with "-jyv".
The processing of "-jy" and "v" switch options have improved to
be consistent with other switch processing.
The ARJ yes/no query prompts have been changed to have a local
and a global effect. See the USER PROMPTS section below.
A new user prompt has been added just before asking for a new
filename during extraction when not overwriting.
Whenever archiving to diskettes, it is HIGHLY recommended that the
option "-jt" be used. This helps spot BAD diskettes or diskette
drives. It is HIGHLY recommended that the "-jt" option be used in
a Windows or network environment.
The command "ARJ e -d archive *.*" will now prompt for permission
to complete the deletion.
Unless the "-jr" (recover) switch is used, ARJ will delete any file
extracted with a CRC or Bad file data error.
The "m" (move) command and "-d" option will NOW delete directories
selected with the "-a1" option.
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.
If you use the software disk cache, HYPERDISK, see the KNOWN ARJ
ISSUES section in ARJ.DOC for important information.
**********************************************************************
USER PROMPTS
The ARJ user prompts have been improved to provide more
flexibility. In addition to the normal yes and no responses, ARJ
also accepts the following responses: quit, always, skip, and
global.
"Global" sets ARJ to inhibit all subsequent user prompts by assuming
YES for all queries as if "-y" were specified.
The "Always" response has changed. It now sets ARJ to assume YES
for subsequent queries of the same class. For example, answering
YES to the overwrite query will assume YES for ALL subsequent
overwrite queries.
"Skip" sets ARJ to assume NO for ALL subsequent queries of the same
class.
Subsequent user prompt messages will still be output to the screen
after the "always" and "skip" responses but no user response will be
accepted.
ARJ ERROR LEVELS
ARJ will now return a DOS errorlevel of 9 when trying to process
a file that is NOT an ARJ archive.
ARJ COMMAND LINE PROCESSING
The option "-x-" will now ignore any previous "-xfilename" options.
ARJ COMMANDS
"a" command
When adding files that replace files in an archive, ARJ will now
display a "Replacing " message to indicate an overwrite.
"e" and "x" commands
When overwriting a file, ARJ will display file size and date-time
information concerning the ARJ file and the DISK file.
"p" command
When using the ARJ "p" command to redirect output to a viewer
program such as "LIST", ARJ will now set the date-time stamp of
the intermediate temporary file to the date of the archived file
as opposed to the current date and time.
ARJ SWITCHES
"-d" switch
The "-d" switch when used during extraction with the wildcard "*.*"
will prompt the user for permission to delete the files. This
prompt can be suppressed with the "-y" or "-jyd" options.
"-i2" switch
The "-i2" switch sets ARJ to display a combined percentage and
bar progress display.
"-m" switch
The "-m1" and "-m2" compression methods have been modified to
improve the compression ratios.
"-od" switch
The "-od" switch sets ARJ to select files no older than the
specified number of days. The days are calculated from midnight.
Examples: ARJ a archive -od0 select files modified today
ARJ a archive -od1 select files modified yesterday
and today
"-v" switch
When the multiple volume ARJ files to be used are located on drives
with removable media (diskette drives, etc.), ARJ will ALWAYS
PROMPT for the next diskette even with the "-y" option specified.
You can always suppress the next volume prompt with the "-jyv"
option. At DOS versions before 3.0, only drives A and B are
considered removable.
ARJ will not allow the updating of multiple volume archives unless
the "-hu" option is specified.
The "r" modifier allows the reservation of disk space on the first
volume. The number after the "r" specifies the space to reserve.
This is useful for software installation volumes.
Example: ARJ a install -v360r50K make first volume 50000 bytes
smaller than 360K.
Example: ARJ u archive -v360u
The "z" modifier works like the "s" modifier except that the system
command is NOT echoed to the screen.
The "-v" switch now accepts its modifiers in any order. The "s"
and "z" modifiers must be last because any succeeding text is
considered the system command to execute.
Examples: ARJ a volume -vavw beep, autosize, whole files
ARJ a volume -vavsDIR beep, autosize, execute DIR
"-w" switch
When using the "-w" switch while archiving to multiple volumes, ARJ
will check the available disk space in the work directory. If
there is not enough space, ARJ will prompt for permission to
continue. This prompt can be suppressed with the "-y" and "-jyd"
switches.
"-y" switch
The "-y" switch will no longer suppress the "-v" next volume prompt
when the archive is located on a drive with removable media such as
a diskette drive.
"-ja1" switch
The "-ja1" switch will suppress the display of the archive comment.
"-jn" switch
The "-jn" switch is used to restart a multiple volume archive. The
index file created by the "-ji" switch at ARJ 2.39b can be used to
facilitate restarting. Please note that index files created by
older versions of ARJ will not work with this restart method. This
method uses the "-jn" syntax without a filename. The previously
written index file is scanned to determine the restart information.
To use this method of restarting, you must specify the "-ji" switch
to build an index file while archiving to multiple volumes. To
restart an interrupted sequence, simply specify the EXACT SAME
command line as before and add "-jn". ARJ will determine the
archive name, the restart filename, and the restart file position.
Example: ARJ a a:volume -va c:\*.* -r -jiINDEX.FIL
ARJ a a:volume -va c:\*.* -r -jiINDEX.FIL -jn
"-jp" switch
The "-jp" switch will be ignored if the ARJ output has been
redirected as in "ARJ l archive -jp > dump".
"-jr" switch
The "end of file" error message will no longer be displayed when
using the "-jr" option on a valid ARJ archive.
"-jy" switch
The "-jy" switch options are now parsed like other switches with
regard to toggling and the "+/-" modifiers. You can also specify
multiple occurrences of the "-jy" options.
Examples: -jyo -jyo evaluates to no change
-jyo -jyo+ evaluates to suppress overwrite prompt
-jyo+c+y+ evaluates to suppress overwrite and create
prompts and use single key input mode
"-ha" switch
The "-ha" switch sets ARJ to reset the attributes of a file to be
overwritten or a file to be deleted. This allows the overwrite or
delete operation to proceed.
A slight performance degradation may result from using this option.
Examples: ARJ e archive -ha
ARJ m archive -ha dir\*.*
"-hc" switch
The "-hc" switch sets ARJ to execute a DOS command at the start of
the execution of ARJ immediately after the command line switch
options have been processed, but before the wildcard search is
started. This can be used to clear the screen to hide the command
line or to provide a pause option to allow swapping diskettes.
Examples: ARJ a -hcCLS archive -gpassword
ARJ a -hcPAUSE archive *.*
"-he" switch
The "-he" switch sets ARJ to abort with an error code of 4 when
processing a possibly ARJ-SECURED archive. This is useful as a
REARJ.CFG option for ARJ. This will prevent REARJ from converting
an ARJ-SECURED archive to the same or another format.
Examples: ARJ l secured.arj -he
"-hi" switch
The "-hi" switch when used with the "-ji" switch sets ARJ to
include the file date-time stamp, the original file size, the
compressed file size, the compression ratio, and the filename in
the index file.
Example: ARJ a a:backup c:\*.* -r -va -jiINDEX -hi
"-hs" switch
The "-hs" switch sets ARJ to disable its file sharing support.
This may be necessary for some unusual applications.
"-hu" switch
The "-hu" switch sets ARJ to allow the updating of multiple volume
archives. At this revision, by default, ARJ does not allow
updating of multiple volume archives because of the possibility of
losing data.
Example: ARJ c archive -hu -zcomment.txt
"-hw" switch
The "-hw" switch sets the ARJ w command to display the
"Searching ..." filenames messages in a scroll saving format.
Filenames of files that do not contain string matches will be
overwritten on the screen.
The "-hw1" switch sets the ARJ w command to ONLY display the
"Searching ..." filenames messages for files that contain string
messages.
end document