morpheus-base

morpheus base system
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uniq.1 (997B)


      1 .TH UNIQ 1 sbase\-VERSION
      2 .SH NAME
      3 uniq \- multi-column
      4 .SH SYNOPSIS
      5 .B uniq
      6 .RB [ \-cdu ]
      7 .RI [ file ]
      8 .SH DESCRIPTION
      9 .B uniq
     10 reads file and writes one copy of a line
     11 from each group of consecutive duplicate lines
     12 to stdout.
     13 If no file is given, uniq reads from stdin.
     14 .SH OPTIONS
     15 .TP
     16 .B \-c
     17 prefixes each line with a count
     18 of its consecutive occurrences in the input.
     19 .TP
     20 .B \-d
     21 suppresses non-duplicate lines
     22 (thus 'uniq -d' prints only duplicates).
     23 .TP
     24 .B \-u
     25 suppresses non-unique lines
     26 (thus 'uniq -u' prints only uniques).
     27 .SH BUGS
     28 The original sbase implementation of
     29 .B uniq
     30 supported multiple input-file arguments,
     31 as e.g. cat and grep do.
     32 Unfortunately, POSIX uniq treats its second argument (if present)
     33 as an output filename and clobbers it.
     34 Since users and scripts which rely on uniq
     35 supporting multiple input-file arguments
     36 would be at risk of data loss
     37 if they ever ran into a POSIX-compatible uniq,
     38 support for multiple input-file arguments
     39 was removed from this implementation.