Here is the example

The user id is xxxx and password is yyyy
123
234
000
987
The user id is xxxx and password is yyyy
333
555
The user id is xxxx and password is yyyy
888
999

I would like to look for first occurence of xxxx, As soon as I find the xxxx and
display 4th line, which is 987

Thanks

I am new to this, but I thought that I would post this as it may help you.

# print the line immediately before a regexp, but not the line
# containing the regexp
sed -n '/regexp/{g;1!p;};h'

(http://www.student.northpark.edu/pem...d/sed1line.txt)

It's not exactly what you are after, but it might be a good starting place