Grep pattern after specific line number in a file -

i running while loop in script ro read file line line.

now want run grep on lines below line being read while loop.

eg:

if while loop on line 4 of file, grep runs below line 4 , not include line 1,2 , 3.

how achievable ?

regards.

you can't grep alone, can if use friends:

tail +100 file_im_searching | grep pattern_i_want 

using + option can tell tail how far file start. if kept track of line number in while loop, this:

tail +$linenumber file | grep pattern 

looking @ details of question, however, wonder if you'd better off passing line have through grep or sed or something..

for example, supposing have read line variable line, perhaps:

set result = $(echo $line | grep stuff_to_search_for)