SED or AWk to delete lines out of file1 based on values in file2?

WiccaChic · #1 (**permalink**) 08-05-04, 16:59

Hello all. I have a big file that I need to delete a number of lines out of. I want to read the values that will determine deletion out of another file, because there are multiple.

Can someone post an example of a sed or awk script to do this?

LKBrwn_DBA · #2 (**permalink**) 08-05-04, 17:25

Try something like this:

Code:

for pat in $(cat patterns.txt)
do
  sed "/$pat/d" <bigfile >newbigfile
  mv newbigfile bigfile
done

Damian Ibbotson · #3 (**permalink**) 08-06-04, 03:37

You could also use grep's -f option...

grep -vf patternFile yourFile > newFile

WiccaChic · #4 (**permalink**) 08-06-04, 09:51

Thanks guys. Someone else suggested the grep thing to me and its so elegant and simple that I am totally amazed.

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