UNIX for Dummies Questions & Answers

A 
13
Z 
23
F
22
Z
413
R 
16

A 
13
F
22
R 
16

grep -A1 -v Z infile

#!/usr/bin/env bash

# @(#) s1	Demonstrate cgrep.
# http://www.bell-labs.com/project/wwexptools/cgrep/
# http://sourceforge.net/projects/cgrep/

# Test run as external user.
# export PATH="/usr/local/bin:/usr/bin:/bin"
# Infrastructure details, environment, commands for forum posts. 
set +o nounset
LC_ALL=C ; LANG=C ; export LC_ALL LANG
echo ; echo "Environment: LC_ALL = $LC_ALL, LANG = $LANG"
echo "(Versions displayed with local utility \"version\")"
c=$( ps | grep $$ | awk '{print $NF}' )
version >/dev/null 2>&1 && s=$(_eat $0 $1) || s=""
[ "$c" = "$s" ] && p="$s" || p="$c"
version >/dev/null 2>&1 && version "=o" $p specimen grep cgrep
set -o nounset
echo

FILE=${1-data1}

# Sample file, with head & tail as a last resort.
specimen $FILE \
|| { echo "(Using head/tail)" ; head -5 $FILE ; echo " --" ; tail -5 $FILE; }

echo
echo " Results, expect failure:"
grep -A1 -v Z $FILE

echo
echo " Results, cgrep:"
cgrep -D -V  +1 Z $FILE

exit 0

% ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0 
GNU bash 3.2.39
specimen (local) 1.15
GNU grep 2.5.3
cgrep - (local: ~/executable/cgrep May 29 2009 )

Whole: 5:0:5 of 10 lines in file "data1"
A 
13
Z 
23
F
22
Z
413
R 
16

 Results, expect failure:
A 
13
Z 
23
F
22
Z
413
R 
16

 Results, cgrep:
A 
13
F
22
R 
16