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Annotation of researchv10dc/man/adm/man1/pack.1, revision 1.1.1.1

1.1       root        1: .TH PACK 1
                      2: .CT 1 files
                      3: .SH NAME
                      4: pack, unpack, pcat, compress, uncompress, zcat \(mi compress and expand files
                      5: .SH SYNOPSIS
                      6: .B pack
                      7: [
                      8: .B -
                      9: ]
                     10: .I file ...
                     11: .PP
                     12: .B unpack
                     13: .I file ...
                     14: .PP
                     15: .B pcat
                     16: [
                     17: .I file ...
                     18: ]
                     19: .PP
                     20: .B compress
                     21: [
                     22: .I option ...
                     23: ]
                     24: [
                     25: .I file ...
                     26: ]
                     27: .PP
                     28: .B uncompress
                     29: [
                     30: .I option ...
                     31: ]
                     32: [
                     33: .I file ...
                     34: ]
                     35: .PP
                     36: .B zcat
                     37: [
                     38: .B -V
                     39: ]
                     40: [
                     41: .I file ...
                     42: ]
                     43: .SH DESCRIPTION
                     44: .I Pack
                     45: attempts to compress the
                     46: .I files
                     47: and places the results in
                     48: corresponding files named
                     49: .IB file .z
                     50: with the same access modes, dates, and owner as the originals.
                     51: Successfully packed files are removed.
                     52: .PP
                     53: .I Unpack
                     54: reverses the process.
                     55: .PP
                     56: .I Pcat
                     57: unpacks files to the standard output.
                     58: .PP
                     59: The
                     60: .B .z
                     61: suffix may be omitted from the name of the
                     62: input file for
                     63: .I unpack
                     64: or
                     65: .I pcat.
                     66: .PP
                     67: .I Pack
                     68: encodes individual characters in a Huffman code.
                     69: Option
                     70: .B -
                     71: causes statistics of the encoding to be printed.
                     72: The option toggles on and off at each appearance among the
                     73: list of
                     74: .I files.
                     75: .PP
                     76: .I Compress, uncompress,
                     77: and
                     78: .I zcat
                     79: work like
                     80: .I pack, unpack,
                     81: and
                     82: .I pcat,
                     83: putting each compressed
                     84: .I file
                     85: into
                     86: .IB file .Z .
                     87: The options are
                     88: .TP
                     89: .B -f
                     90: (force)
                     91: Compress even when it doesn't save space.
                     92: .TP
                     93: .B -c
                     94: Write to the standard output; change no files.
                     95: .I Zcat
                     96: is identical to
                     97: .I uncompress
                     98: .B -c.
                     99: .TP
                    100: .BI -b bits
                    101: .I Compress
                    102: uses a modified Lempel-Ziv encoding.
                    103: Common substrings in the file are replaced by
                    104: variable-length codes up to size
                    105: .I bits
                    106: (default 16).
                    107: Smaller limits devour less address space.
                    108: .TP
                    109: .B -v
                    110: Print percent reduction for each file.
                    111: .TP
                    112: .B -V
                    113: Print program version number.
                    114: .PP
                    115: .I Compress-uncompress
                    116: pack better and are faster overall;
                    117: .I pack-unpack
                    118: work on smaller machines and are much more widely available.
                    119: .SH "SEE ALSO"
                    120: T. A. Welch,
                    121: `A Technique for High Performance Data Compression,'
                    122: .I "IEEE Computer,"
                    123: 17 (1984) 8-19.
                    124: .SH DIAGNOSTICS
                    125: The exit code of
                    126: .I pack, unpack,
                    127: or
                    128: .I pcat
                    129: is the number of files it failed to process.
                    130: .PP
                    131: The exit code of
                    132: .I compress, uncompress,
                    133: or
                    134: .I zcat
                    135: is 0 normally, 1 for error, 2 for ineffective compression
                    136: (i.e. expansion).

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