Question

so thanks to this forum, I currently have this code, which takes an output from a programme I have and saves it in a file:

#!usr/bin/python
import os

os.chdir('./P574/J0998-1034')
os.system('vap -c freq *.SFTC > 1400list.txt')

I wanted to add a filter (so take only lines that contained “1369.000”, so I amended the last line to:

os.system('vap -c freq *.SFTC | egrep 1369.000 > 1400listfilt.txt')

But I really want it to take lines that contain EITHER “1369.000” OR “1433.000”. I tried:

os.system('vap -c freq *.SFTC | egrep 1369.000|1433.000 > 1400listfilt.txt' )

But I got the error message: “sh: 1433.000: command not found
egrep: write error: Broken pipe”

How can I make it check for two values? Also.. is this the best way to do what I am trying to do?

Thank you!

Answer 1

I would surround the arguments in single quotes as such:

egrep '(1369.000|1433.000)'

The shell is telling you that it could not redirect the output of egrep to the program 1433.000 which doesn’t exist.