grep -f file1 file2

Shell Programming and Scripting
1

Wat does this command do?

fileA is a subset of fileB..now, i need to find the lines in fileB that are not in fileA...i.e fileA - fileB.

diff fileA fileB gives the ouput but the format looks no good....

I just need the contents alone not the line num etc.

2

diff is the command for you

3

for ex: the contents of fileA is
A
B
C

and that of fileB is

A
C

now,diff fileA fileB

would give

2d1
< B

as the output

But i need only the difference not the line info ....
i.e the output should be

B

4

Use..

grep -vf infile1 infile2

where infile1 is a subset of infile2

5

are u sure..?

grep -vf file1 file2 does not work as intended.somother solution,please.

6

The below will work....

$ cat infile1
A
B
C

$ cat infile2
A
C

$ grep -vf infile2 infile1
B
7

here are the 2 file say "A" and "B"
file "A" contains
hey
the
output
is

while file "B" contains
hey
the
updated
output
later
is

Now if you try the command
diff A B

The output will be

2a3
> updated
3a5
> later

grep -vf file1 file2
also works fine as suggested by whiteboard
provided file1 is a subset of file2

Hope this helps

8

Thanks Whiteboard n gaurvacl...
that works absolutely fine...great!