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Thanks you very much !!!!, nawk worked.

hi,i tried with that option also. still getting error. below is my exact command.

# awk '$0~s{print r[NR%b]}{r[NR%b]=$0}' b=4 s="0x9f 0x81 0x19 0x01 0x02" test2.log | pg
awk: syntax error near...

thanks to you all, i am looking single line command and i am getitng error for first two replies.

grep: illegal option -- B
grep: illegal option -- 4
Usage: grep -hblcnsviw pattern file . . .
...

Can some one help me to print 4th line before the match using egrep or grep command options.
i have a very large file and i need to search the entire file, look for the match (key word) and print...