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Shell Programming and Scripting

File Comparison

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# 8  
Old 01-02-2008
Do we have to loop?

Code:
$ cat f1
11111122222222333333aaaaaaaaaabbbbbbbbbccccccccdddddd
91111122222222333333aaaaaaaaaabbbbbbbbbccccccccdddddd
81111122222222333333aaaaaaaaaabbbbbbbbbccccccccdddddd
$
$ cat f2
11111122222222333333aaaaaaaaaabbbbbbbbbccccccccddeddd
11111122222222333333aaaaaaaaaabbbbbbbbbccccccccdddddd
11111122222222333333aaaaaaaaaabbbbbbbbbccccccccddeddd
91111122222222333333aaaaaaaaaabbbbbbbbbccccccccdddddd
$
$ diff f1 f2 |grep "<" |cut -d"<" -f2 |cut -c2-
81111122222222333333aaaaaaaaaabbbbbbbbbccccccccdddddd

HTH
# 9  
Old 01-02-2008
I'd probably use diff too...

If the lines in the files are similar to the lines you put in your first post, meaning there are no spaces on the lines, you could:

Code:
#!/bin/sh
for k in `cat file1`
do
  grep -m 1 $k file2 > /dev/null
  if [ $? -eq 1 ]; then echo $k; fi 
done

the -m1 will cause grep to exit after the first match is found. If no match is found grep will exit with status 1, you can use that to determine if the line exists in file 2 or not. Keep in mind, that "for k in `cat`" stuff will break if you have spaces in the lines in the file.
# 10  
Old 01-03-2008
You can use grep -v -f
grep -v -f file1 file2

This will give you all the lines in file2 which are not in file1
# 11  
Old 01-03-2008
This is excellant stuff, this is exactly what I wanted. Thank you so much.
# 12  
Old 01-04-2008
Guess I got excited too early.
It worked fine for small files, but when I tried on large files (200+MB), it ran for 3 hours and still was running and I had to kill.
Appreciate for any other alternate tips considering the size of the files also.
# 13  
Old 01-05-2008
Which one were you running?
# 14  
Old 01-05-2008
grep -v -f file1 file2
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