Shell Programming and Scripting

Hi all

I need to write a small shell script, where we have one Log file and another File 1 containing some tags in it.

My log file can have multiple tags in it which can be other than the ones that are part of File 1.

So I need to write a script that will run and test whether the tags present in Log file are same as the ones that are in file 1

If there are some other tags in Log file other than file 1 then we need to make a file 2 containing all the new tags that are not present in File1.

Please help me in writing this script as it is very urgent

Regds,
Hitesh

See man pages of comm. See if it helps.

Hey man can u please elaborate a bit more on it ...

i am new to this forum

Suppose file1 contains
1
2
3
4
5
6
7
and file2 contains
4
5
6
7
8
9
13
24
34
then

comm -12 prints lines common to two files.
comm -12 file1 file2
4
5
6
7
Check 'man comm'. Also remember comm works on sorted files.

Hi

thats so gr8 of u that u hv helped me by writing an example but now i hv understood that comm will give u the comm tags /numbers in the 2 files ....

but if i look at this example itself what i need now is that i need to create a new file file 3 that will hv all the tags/ numbers that do not belong to file 2 but are part of file 1....

so my file 3 should be like
1
2
3


Please help me a bit on this ...

thanx in advance

Check manual. Its all there. by the way, for your question -
comm -23 file1 file2 --> will give you lines in file1 and not in file2. You can redirect this output to a new file as required.
comm -23 file1 file2 >file3