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40 lines
997 B
Groff
40 lines
997 B
Groff
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.TH UNIQ 1 sbase\-VERSION
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.SH NAME
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uniq \- multi-column
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.SH SYNOPSIS
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.B uniq
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.RB [ \-cdu ]
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.RI [ file ]
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.SH DESCRIPTION
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.B uniq
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reads file and writes one copy of a line
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from each group of consecutive duplicate lines
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to stdout.
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If no file is given, uniq reads from stdin.
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.SH OPTIONS
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.TP
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.B \-c
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prefixes each line with a count
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of its consecutive occurrences in the input.
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.TP
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.B \-d
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suppresses non-duplicate lines
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(thus 'uniq -d' prints only duplicates).
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.TP
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.B \-u
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suppresses non-unique lines
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(thus 'uniq -u' prints only uniques).
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.SH BUGS
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The original sbase implementation of
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.B uniq
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supported multiple input-file arguments,
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as e.g. cat and grep do.
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Unfortunately, POSIX uniq treats its second argument (if present)
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as an output filename and clobbers it.
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Since users and scripts which rely on uniq
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supporting multiple input-file arguments
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would be at risk of data loss
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if they ever ran into a POSIX-compatible uniq,
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support for multiple input-file arguments
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was removed from this implementation.
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