How to filter lines

Nortekman · 04-01-2009, 10:09 AM

What is the command to filter lines that have a certain "strings" in a file?

druuna · 04-01-2009, 10:16 AM

Hi,

Filter as in remove or as in show?

grep -v "whatever" infile -> removes all lines that contain whatever

grep "whatever" infile -> show all lines that contain whatever

Hope this helps.

Nortekman · 04-01-2009, 10:32 AM

Quote:

Originally Posted by druuna

Hi,

Filter as in remove or as in show?

grep -v "whatever" infile -> removes all lines that contain whatever

grep "whatever" infile -> show all lines that contain whatever

Hope this helps.

Thanks for your help druuna, that helped a lot!

pixellany · 04-01-2009, 10:35 AM

Many utilities will do this---not just grep.

I suggest two references:
Bash Guide for Beginners--free at http://tldp.org

Classic Shell Scripting from O'Reilly --Any large bookstore, Amazon, etc.