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pipe search pattern into a grep

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# 1  
Old 05-03-2012
pipe search pattern into a grep
Code:
comm -13 tmpfile tmpfile2 | grep -v <filename> >newfile

so i want to
1. find records in 1 file bot not in another
2. The output of the first part is 1 field in a file with many fields.
3. find all the records that do not have the value piped from step #1
4. redirect to a new file

when I do this, grep is expecting a file name and not a search value.
# 2  
Old 05-03-2012
So you want grep to read expressions from the pipe, not data? I think you'll need a temporary file. Then you can feed grep the list of expressions via -f.

Code:
comm -13 tmpfile tmpfile2 > /tmp/$$
grep -f /tmp/$$ filename > newfile
rm -f /tmp/$$

If you want them to be considered fixed strings, not regexes, you can put an -F before the -f too.
# 3  
Old 05-03-2012
Combined:
Code:
comm -13 tmpfile tmpfile2 | grep -vf- filename > newfile

This User Gave Thanks to Scrutinizer For This Post:
Corona688
# 4  
Old 05-04-2012
thanks, but I don't quite follow the syntax

Code:
comm -13 tmpfile tmpfile2 | grep -vf- filename > newfile

-vf-

what is vf?

why do you have a '-' after the f? I have never seen that in unix before with any function.

---------- Post updated at 10:16 AM ---------- Previous update was at 10:07 AM ----------

corona,

can i do this with a pipe with awk or sed or something else? so i dont create files? I can create them, just trying to figure out better ways to do things.
# 5  
Old 05-04-2012
It could also be written as grep -v -f - . "-" is a placeholder for stdin. It does not work with functions, but it works with many utilities.
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