[hackers] [sbase] uniq: WTFM || Robert Ransom

From: <hg_AT_suckless.org>
Date: Tue, 22 May 2012 13:08:54 +0200 (CEST)

changeset: 134:f0e37e63335c
user: Robert Ransom <rransom.8774_AT_gmail.com>
date: Mon May 21 23:46:22 2012 +0000
files: uniq.1
description:
uniq: WTFM


diff -r 9187cbaf2ea3 -r f0e37e63335c uniq.1
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/uniq.1 Mon May 21 23:46:22 2012 +0000
_AT_@ -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.
Received on Tue May 22 2012 - 13:08:54 CEST