Question

Possible Duplicate:
Use grep to report back only line numbers

I only want to see the line number. I don’t need to see the remaining output.

Answer 1

Pipe your grep -n output, which normally looks something like:

11: stuff that matched
43: more stuff that matched

through sed to strip out the matching parts:

grep -n pattern file | sed -e 's/:.*//g'

11
43