UNIX for Advanced & Expert Users

#!/usr/bin/env sh

# @(#) s1       Demonstrate grep with quoted word boundary assertions.

set -o nounset
echo

debug=":"
debug="echo"

## Use local command version for the commands in this demonstration.

echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version bash

echo
FILE=${1-data1}
echo " Input file $FILE:"
cat $FILE

echo
echo " Results from grep -w:"
grep -w aaa $FILE

echo
echo " Results from grep word boundary assertions quoted:"
grep "\<aaa\>" $FILE

echo
echo " Unquoted and quoted backslashes:"
echo \< and "\<"

exit 0

% ./s1

(Versions displayed with local utility "version")
GNU bash 2.05b.0

 Input file data1:
aaa bbb ccc
ddd eee ffff

 Results from grep -w:
aaa bbb ccc

 Results from grep word boundary assertions quoted:
aaa bbb ccc

 Unquoted and quoted backslashes:
< and \<