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Annotation of coherent/a/usr/man/COHERENT/compress, revision 1.1.1.1

1.1       root        1: 
                      2: 
                      3: compress                     Command                     compress
                      4: 
                      5: 
                      6: 
                      7: 
                      8: Compress a file
                      9: 
                     10: ccoommpprreessss [ -ddffvvcc ] [ -bb_n_u_m ] [ -ww _t_e_m_p_f_i_l_e ] [ _f_i_l_e ... ]
                     11: 
                     12: compress compresses a  file using the Lempel-Ziv algorithm.  With
                     13: text  files  and  archives, it  often  can  achieve  50% rate  of
                     14: compression.
                     15: 
                     16: If one or more files  are specified on the command, compress com-
                     17: presses them and appends the suffix  .ZZ onto the end of each com-
                     18: pressed  file's name.   If no  file is  specified on  the command
                     19: line, compress compresses text from the standard input and writes
                     20: the compressed text to the standard output.
                     21: 
                     22: compress recognizes the following options:
                     23: 
                     24: -dd   Decompress rather than compress.
                     25: 
                     26: -ff   Force  an output file  to be generated  even if no  space is
                     27:      saved by compression.
                     28: 
                     29: -vv   Verbose  mode: force compress to  write statistics about its
                     30:      performance.
                     31: 
                     32: -cc   Send output to stdout.
                     33: 
                     34: -bb   The  ``bits'' option.   compress uses the  compression level
                     35:      set  via the  num argument.   Previous releases  of compress
                     36:      would only allow  values of num up to 12,  with 12 being the
                     37:      default value if the  -b option was not specified.  The ver-
                     38:      sion of compress  introduced with COHERENT version 3.1 hand-
                     39:      les values up to 16, with 12 being the default.
                     40: 
                     41: -ww   The  ``workfile'' option.   compress uses workfile  to write
                     42:      its  temporary file.   By default  compress uses  RAM device
                     43:      /dev/ram1  for temporary  storage.  For  this reason,  it is
                     44:      strongly advised  that you not use /dev/ram1  as a RAM disk.
                     45:      This  option  may  be  necessary  on machines  with  limited
                     46:      amounts of RAM.
                     47: 
                     48: If  you  wish to  ensure  backwards  compatibility with  previous
                     49: releases  of  COHERENT, do  not  use compress  with  a num  value
                     50: greater than 12.
                     51: 
                     52: ***** See Also *****
                     53: 
                     54: commands, ram, uncompress, zcat
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                     63: 
                     64: COHERENT Lexicon                                           Page 1
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