Shell Programming and Scripting

diff dir1 dir2|grep "^Only in"

#!/usr/bin/env bash

# @(#) s1	Demonstrate difference of files.

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C grep

pl " Input data file data.?:"
head data.?

pl " Results:"
grep -vf <( cat data.[23] | sort -u ) data.1

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 5.0.8 (lenny) 
bash GNU bash 3.2.39
grep GNU grep 2.5.3

-----
 Input data file data.?:
==> data.1 <==
1.txt
2.txt
5.txt
6.txt

==> data.2 <==
1.txt
3.txt
4.txt
7.txt

==> data.3 <==
1.txt
3.txt
5.txt
8.txt

-----
 Results:
2.txt
6.txt