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  #7 (permalink)  
Old 10-27-2006
ghostdog74 ghostdog74 is offline Forum Advisor  
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Join Date: Sep 2006
Posts: 2,557
Quote:
Originally Posted by kingdbag
Say I want to grep for a line with EXEC in it

grep EXEC blah.conf

thats cool but what if i want to grep for EXEC and if it finds a line with that in it to also grab the two lines above it?
Python alternative:
Sample input:
abc
def
ghi
EXEC
klm
nop
qrs
tuv
wxy



Code:
#!/usr/bin/python
data = open("input.txt").readlines()
for linenum , line in enumerate(data):
 	if 'EXEC' in line:
 		print ''.join(data[linenum - 2 : linenum])

output:

Code:
def
ghi