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Diff for /src/usr.bin/compress/compress.1 between version 1.13 and 1.14

version 1.13, 2002/05/30 20:34:57 version 1.14, 2002/12/08 16:07:54
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 .Nd compress and expand data  .Nd compress and expand data
 .Sh SYNOPSIS  .Sh SYNOPSIS
 .Nm compress  .Nm compress
 .Op Fl cdftgOqv  .Op Fl LV
   .Nm compress
   .Op Fl cdfgOqtv123456789
 .Op Fl b Ar bits  .Op Fl b Ar bits
 .Op Fl o Ar filename  .Op Fl o Ar filename
 .Op Ar  .Op Ar
 .Nm uncompress  .Nm uncompress
 .Op Fl cftoqv  .Op Fl cfoqtv
 .Op Fl o Ar filename  .Op Fl o Ar filename
 .Op Ar  .Op Ar
 .Nm zcat  .Nm zcat
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 Each  Each
 .Ar file  .Ar file
 is renamed to the same name plus the extension  is renamed to the same name plus the extension
 .Dq .Z .  .Dq .Z ,
   or
   .Dq .gz
   (in deflate mode).
 As many of the modification time, access time, file flags, file mode,  As many of the modification time, access time, file flags, file mode,
 user ID, and group ID as allowed by permissions are retained in the  user ID, and group ID as allowed by permissions are retained in the
 new file.  new file.
 If compression would not reduce the size of a  If compression would not reduce the size of a
 .Ar file ,  .Ar file ,
 the file is ignored.  the file is ignored (unless
   .Fl f
   is used).
 .Pp  .Pp
 The  The
 .Nm uncompress  .Nm uncompress
 utility restores compressed files to their original form, renaming the  utility restores compressed files to their original form, renaming the
 files by removing the  files by removing the
 .Dq .Z  .Dq .Z
   or
   .Dq .gz
 extension.  extension.
 .Pp  .Pp
 The  The
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 .Pp  .Pp
 The options are as follows:  The options are as follows:
 .Bl -tag -width Ds  .Bl -tag -width Ds
   .It Fl L
   Display the source code license and exit.
   .It Fl V
   Display the program version (RCS Ids of the source files) and exit.
 .It Fl b Ar bits  .It Fl b Ar bits
 Specify the  Specify the
 .Ar bits  .Ar bits
 code limit (see below).  code limit (see below).
 .It Fl c  .It Fl c
 Compressed or uncompressed output is written to the standard output.  Compressed or uncompressed output is written to the standard output.
 No files are modified.  No files are modified (force
   .Nm zcat
   mode).
 .It Fl d  .It Fl d
 Decompress the source files instead of compressing them.  Decompress the source files instead of compressing them (force
   .Nm uncompress
   mode).
 .It Fl f  .It Fl f
 Force compression of  Force compression of
 .Ar file ,  .Ar file ,
 even if it is not actually reduced in size.  even if it is not actually reduced in size.
 Additionally, files are overwritten without prompting for confirmation.  Additionally, files are overwritten without prompting for confirmation.
 .It Fl g  .It Fl g
 Use deflate scheme which reportedly provides better compression rates.  Use deflate scheme which reportedly provides better compression rates (force
   .Nm gzip
   mode).
   .It Fl 1...9
   Use deflate scheme with compression factor of one to nine.
 .It Fl O  .It Fl O
 Use old compression method (default is based on the program name).  Use old compression method.
 .It Fl o Ar filename  .It Fl o Ar filename
 Set the output file name.  Set the output file name.
   .It Fl S Ar suffix
   Set suffix for compressed files.
 .It Fl t  .It Fl t
 Test the integrity of each file leaving any files intact.  Test the integrity of each file leaving any files intact.
 .It Fl q  .It Fl q
 Be quiet, suppress any messages.  Be quiet, suppress all messages.
 .It Fl v  .It Fl v
 Print the percentage reduction of each file.  Print the percentage reduction of each file and other information.
 .El  .El
 .Pp  .Pp
   In normal mode,
 .Nm  .Nm
 uses a modified Lempel-Ziv algorithm.  uses a modified Lempel-Ziv algorithm.
 Common substrings in the file are first replaced by 9-bit codes 257 and up.  Common substrings in the file are first replaced by 9-bit codes 257 and up.
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 .Pp  .Pp
 The  The
 .Nm  .Nm
 utility exits 0 on success, 1 if an error occurred, or 2 if one or  utility exits with 0 on success, 1 if an error occurred, or 2 if one or
 more files were not compressed because they would have grown in  more files were not compressed because they would have grown in
 size (and  size (and
 .Fl f  .Fl f
Legend:
Removed from v.1.13  
changed lines
  Added in v.1.14