Sed with python os.system()

tao_goldi · 02-03-2011, 03:46 PM

Hello All,

I need help please. I am trying the execute the following

#!/usr/bin/python
import os

os.system("sed -e 's#^\(.*\)\t\(.*\)0http://\1\2#' t2.txt > t3.txt")

os.system("cat t3.txt | sort | uniq -c | sort -rn | head > t4.txt")

But I receive the following error message.

sed: -e expression #1, char 27: unterminated `s' command

any ideas? Please help

acid_kewpie · 02-03-2011, 04:10 PM

I think using os.system to do that is really pretty horrible, If you're using python, then use python code to do this natively, and maintain full control over what's going on. os.system() will not help you control your program flow. As for what's wrong though, you've not got two parts to the s command, as it says. you have a # at either end, replacing a conventional / (didn't know you could do that... thanks!) but nothing in the middle, so it's all just interpreted as the first half.