grep where expressions reside in file - UNIX for Dummies Questions & Answers

GMMike · #1 (**permalink**) 03-08-2005

I have a program that displays many messages on stdout.
I have another file that contain error messages only - Each line is a separate message. (msgs.txt)

I am trying to show only the errors and not all the output.

I tried this but got nothing:

myprog | grep < msgs.txt

I also tried this

myprog | grep < `cat msgs.txt`

but both did not work....

Any suggestions?

Thanks a lot

vgersh99 · #2 (**permalink**) 03-08-2005

myprog | grep -f msgs.txt

GMMike · #3 (**permalink**) 03-08-2005

I found that when I use -f alone grep displays all the input file and that -wf works well.

Thanks for your help.

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