What bash command can be used for regex substitution on a pipe?
cat foo.txt | someprogram
You probably want
sed 's/exp1/exp2/g' foo.txt > foo2.txt
Read more at Sed tutorial, Another tutorial, and A small tutorial at Linux HOWTOs
You can also use perl one liners if you find you want more regular expression features than sed provides. See this link for a comparison. nik's example would look like:
perl -ple 's/exp1/exp2/g' foo > foo2.txt
The program you are looking for is sed.
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6 years ago