#!/bin/bash: list all users.PASSWORD_FILE=/etc/passwdn=1for name in $(awk 'BEGIN{FS=":"}{print $1}' < "$PASSWORD_FILE" )do        echo "USER #$n = $name"        let "n+=1"doneexit $?

#!/bin/bash# bin-grep.sh: locates matching strings in a binary file.E_BADARGS=65E_NOFILE=66if [ $# -ne 2 ]then        echo "Usage: `basename $0` search_string filename"        exit $E_BADARGSfiif [ ! -f "$2" ]then        echo "File \"$2\" does not exit."        exit $E_NOFILEfiIFS=$'\012'for word in $( strings "$2" | grep "$1" )        # the "strings" command lists strings in binary files.        # output then piped to "grep", which tests for desired string.do        echo $worddoneexit 0