commit 8ed28e50e44a5ccdbe263b5dbc0e415811e7d0f0 parent a16f603b205d30ad5aa1adb75d8e285ab0d26f97 Author: Robert Ransom <rransom.8774@gmail.com> Date: Mon, 21 May 2012 23:46:22 +0000 uniq: WTFM Diffstat:
| A | uniq.1 | | | 39 | +++++++++++++++++++++++++++++++++++++++ |
1 file changed, 39 insertions(+), 0 deletions(-)
diff --git a/uniq.1 b/uniq.1 @@ -0,0 +1,39 @@ +.TH UNIQ 1 sbase\-VERSION +.SH NAME +uniq \- multi-column +.SH SYNOPSIS +.B uniq +.RB [ \-cdu ] +.RI [ file ] +.SH DESCRIPTION +.B uniq +reads file and writes one copy of a line +from each group of consecutive duplicate lines +to stdout. +If no file is given, uniq reads from stdin. +.SH OPTIONS +.TP +.B \-c +prefixes each line with a count +of its consecutive occurrences in the input. +.TP +.B \-d +suppresses non-duplicate lines +(thus 'uniq -d' prints only duplicates). +.TP +.B \-u +suppresses non-unique lines +(thus 'uniq -u' prints only uniques). +.SH BUGS +The original sbase implementation of +.B uniq +supported multiple input-file arguments, +as e.g. cat and grep do. +Unfortunately, POSIX uniq treats its second argument (if present) +as an output filename and clobbers it. +Since users and scripts which rely on uniq +supporting multiple input-file arguments +would be at risk of data loss +if they ever ran into a POSIX-compatible uniq, +support for multiple input-file arguments +was removed from this implementation.