to compare two files and to print the difference

Shell Programming and Scripting
1

suppose one file
P1168S
P2150L
P85L
Q597R
R1097C

Another file
P2150L
P85L
Q597R
R1097C
R1379C
R1587K

Then output shud be
R1379C
R1587K

thanks

2

Why not P1168S - it is not in "another file"

3

use cmp file1 file2
or
diff file1 file2

what exactly are you looking for?

cheers,
Devaraj Takhellambam

4

yah ....
u have a file1 and file2 then contents not found in file 2 shud be displayed

5

Use this...Please note that this will work for sorted files

comm -23 file1 file2
6 
awk 'BEGIN { while ( getline < "firstfile" ) { arr[$0]++ } } { if (!( $0 in arr ) ) { print } }' secondfile