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- Jouni Miettunen * jon@stekt.oulu.fi * Oulu * Finland * Europe * 1993-96
-
- FILEX(1) USER COMMANDS FILEX(1)
-
-
-
- NAME
- filex - determine the type of a file by examining its name
- and extension.
-
- SYNOPSIS
- file [ -1abdfnpqR?* ] target ...
-
- DESCRIPTION
- filex studies the filename extension and tells what kind of
- files and what programs usually use that specific extension.
-
- filex uses the database file extensio.txt or any other user
- defined data file to look up the extension information.
-
- OPTIONS
- -1 Show and study each different file extension only once.
-
- -a Show all known possibilities.
-
- -b filename.ext
- Identify only given filename extension, these bogus
- files don't have to exist.
-
- -d Show the current directory name at the beginning.
-
- -f Don't handle hidden or system files (Force).
-
- -n Show only unknown files (Noise).
-
- -p Pause after each screen page and wait for a key press.
-
- -q Show only known files (Quiet).
-
- -R Recurse through all subdirectories.
-
- -? Info.
-
- -* Print the database Redblack search tree
-
- EXAMPLES
-
- Command line options can be given separated or together and
- the switch can be either unixlike "-" or DOS-like "/":
-
- filex -1 -n *.*
- filex /1 /n *.*
- filex -n1 *.*
- filex /n -1 *.*
-
- Period "." is same as "*.*" and giving a directory name
- identifies all files in that directory:
-
- filex *.*
- filex .
- filex d:
- filex c:\dir\subdir
-
- You can have several targets specified on command line,
- including wildcards:
-
- filex ..\a*.* project.* d: dir1\ dir2
-
- You can identify files that don't exist with -b (bogus) option:
-
- filex -b file.a file.b file.c
- filex -b .ext
-
- If you don't want to identify some files and have a tool to
- temporarily change their file attribute to hidden:
-
- except (a*.*) filex -f *.*
-
- Listfiles are supported and thus you can check the database:
-
- filex @extensio.txt
-
- Little mark (Ascii 250) in front of description notifies if
- there are available several descriptions for the extension.
- You can see all of them by using -a (all) option:
-
- C:\>filex filex.c
- filex.c ·C source code file
-
- C:\>filex -a filex.c
- filex.c ·C source code file
- compressed unix file archive created by COMPACT
-
-
- Or you could first locate all extensions with more than one
- possible description and then check only them more closely:
-
- filex . | grep "·" > tmp ( · is Ascii 250)
- filex -ap @tmp
-
- If you want to know all file extensions related to some area,
- you can use option -w to search the database. Please remember
- the search is case sensitive ie. a is not A:
-
- filex -w graphics
- filex -w "source code"
- filex -w source code
-
- NOTE: the last feature is at the moment disabled. It was part
- of an ambitious idea, which was never realized. This is a note
- for myself to remember the fact and an excuse for old users..
-
- ENVIRONMENT
- Environment variable FILEX can be set to point to any valid
- File Extension Database.
-
- set filex=database.ext
-
- FILES
- extensio.txt
-
- First Filex checks if environment variable FILEX exists and
- then if a file named "extensio.txt" exist in any directory
- specified in the PATH.
-
- Format of File Extansion Database is the following:
- - first character of every line is . (period, ASCII 46)
- - 1 to 3 characters (extension)
- - TAB character (horizontal TAB, ASCII 9)
- - min 5 to max 63 characters (description of extension)
- - every line has to end with CR/LF
- - even the last line has to end with CR/LF (usually does)
-
- At the moment the max allowed database size is restricted by
- the amount of free conventional memory ie. free memory below
- 640 KB memory boundary. The same memory area has to hold also
- the tree nodes that take quite a bit of memory. At least 330k
- database (8315 extensions) has been used without problems.
-
- A self-balancing red-black tree is created so that the first
- found description for extension will always be told as first.
- You can customize the output by changing the order of lines
- in database. They can be in any order, I just like to see them
- alphabetically for other purposes.
-
- @listfile
-
- The program supports listfiles eg. you can collects filenames
- into a file and then give that preceded by @ character as an
- argument to Filex. For every line only the first possible filename
- extension is identified as a bogus filename, but there can be more
- text on same line. Please note that only the first 12 characters
- of a each line are read and checked. This is enough for the DOS
- 8+3 filenames, but not for any path.
-
- HISTORY
- 0.0 late 1992 file.btm (4DOS batch file)
- 1.0 30-Jan-93 original version based on file.btm (jambtm02.zip)
- (1000 extensions)
- 1.1 28-Feb-93 red-black tree functions & large memory model
- 1.2 27-Jun-93 2x faster start up (64K data limit)
- (1200 extensions)
- 1.21 03-Jul-93 I forgot to enable "notify if several"..
- 1.3 02-Aug-93 @listfile support, bugfix in Notify, credits,
- removed all DEBUG code (about 10K smaller),
- pause after each screen page, long extensions,
- word search in database
- (1500 extensions)
- 1.4 13-Jun-94 Cormen,Leiserson,Rivest bottom-up redblack tree
- About 10% faster start == datatree creation
- Ported to TC3++ -> exe 26k instead of 45k
- (1600 extensions)
- 1.41 24-Nov-94 Cleaned up the code - not a public release
- 1.5 10-Apr-95 64k database limitation removed (and still in
- large memory model and without HUGE pointers :)
- Rewrote @listfile code == made >64k compatible
- (1700 extensions)
- 1.6 08-Jun-96 No changes in code, over 1800 extensions. I
- still use this program actively! I also made
- a WWW page for the extensions.
-
- SEE ALSO
- Robert Sedgewick: "Algorithms in C" ISBN 0-201-51425-7 (p.220)
-
- Dr. Dobb's Journal #187 April 1992 (p.42) Bruce Schneier:
- "Red-Black Trees"
-
- Cormen, Leiserson, Rivest: "Introduction to Algorithms" (p.263)
- ISBN 0-262-03141-8 (MIT Press)
-
- Filex is not perfect, but it's a perfect companion for a fully
- unixlike File utility. At the moment I know two good ones:
-
- Ricki's File2, Filed39a (see others.txt for more information)
-
- BUGS
- If file has a wrong filename extension, filex obviously makes
- a wrong identification. No other known bugs.
-
- STATUS
- This program is Freeware. Use, share and enjoy. The File Extension
- database can be freely used (see Credits.txt for terms).
-
- AUTHOR
- Mr. Jouni Miettunen
- Rautatienkatu 20 A 10
- FIN-90100 OULU
- FINLAND - EUROPE
-
-
-
- FILEX(1) USER COMMANDS FILEX(1)
-
- Jouni Miettunen * jon@stekt.oulu.fi * Oulu * Finland * Europe * 1993-96
-