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Diff for /src/usr.bin/compress/compress.1 between version 1.5 and 1.6

version 1.5, 1997/08/19 06:33:37 version 1.6, 1998/09/23 04:32:38
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 .\".Nm zcat  .\".Nm zcat
 .\".Op Ar  .\".Op Ar
 .Sh DESCRIPTION  .Sh DESCRIPTION
 .Nm Compress  .Nm compress
 reduces the size of the named files using adaptive Lempel-Ziv coding.  reduces the size of the named files using adaptive Lempel-Ziv coding.
 Each  Each
 .Ar file  .Ar file
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 .Ar file ,  .Ar file ,
 the file is ignored.  the file is ignored.
 .Pp  .Pp
 .Nm Uncompress  .Nm uncompress
 restores the compressed files to their original form, renaming the  restores the compressed files to their original form, renaming the
 files by deleting the  files by deleting the
 .Dq .Z  .Dq .Z
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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 b  .It Fl b Ar bits
 Specify the  Specify the
 .Ar bits  .Ar bits
 code limit (see below).  code limit (see below).
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 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 wich reported to provide better compression rates.  Use deflate scheme which reportedly provides better compression rates.
 .It Fl O  .It Fl O
 Use old compression method (default is based on the program name).  Use old compression method (default is based on the program name).
 .It Fl o  .It Fl o Ar filename
 Set the output file name.  Set the output file name.
 .It Fl t  .It Fl t
 Test the entefrity of each file leaving any files intact.  Test the integrity of each file leaving any files intact.
 .It Fl q  .It Fl q
 Be quite, suppress any messages.  Be quiet, suppress any messages.
 .It Fl v  .It Fl v
 Print the percentage reduction of each file.  Print the percentage reduction of each file.
 .El  .El
 .Pp  .Pp
 .Nm Compress  .Nm compress
 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.
 When code 512 is reached, the algorithm switches to 10-bit codes and  When code 512 is reached, the algorithm switches to 10-bit codes and
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 limit specified by the  limit specified by the
 .Fl b  .Fl b
 flag is reached (the default is 16).  flag is reached (the default is 16).
 .Ar Bits  .Ar bits
 must be between 9 and 16.  must be between 9 and 16.
 .Pp  .Pp
 After the  After the
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 .Pp  .Pp
 The  The
 .Nm compress  .Nm compress
 utility exits 0 on success, 1 if an error occurs, and 2 if one or  utility exits 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 -f was not specifed).  size (and
   .Fl f
   was not specifed).
 .Sh SEE ALSO  .Sh SEE ALSO
 .Rs  .Rs
 .%A Welch, Terry A.  .%A Welch, Terry A.
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 .Nm  .Nm
 command appeared in  command appeared in
 .Bx 4.3 .  .Bx 4.3 .
 The deflate compression support added in  The deflate compression support was added in
 .Ox 2.1 .  .Ox 2.1 .
Legend:
Removed from v.1.5  
changed lines
  Added in v.1.6