Comparing two files

[ianicr]

Is there an easy way to compare 2 files and see duplicates between the two of them? I know I can do a grep -f file1 file2 but these are pretty big files and grep takes forever. Is there an easier way?

 

[KenCunningham]

man comm and see if this will do what you want. Cheers.

 

[dickiebird]

Try:

awk 'BEGIN{
while ((getline < &quot;file1&quot > 0) { arr[ $1] = 1}
}
{
if( arr[$1] == 1) print
}' file2


Dickie Bird (-)))

 

[bigoldbulldog]

To see items common in both try out

sort file1 file2 | uniq -d

The sort will take time for large files. Perhaps sorting each first and then using comm on the results is fastest overall.

Cheers,
ND

bigoldbulldog@hotmail.com

 

[PHV]

man diff

Hope This Help
PH.