Search and replace

Is there a way to do search _and_ replace on the command line? the grep family are fine for doing matches, but they don't so substitutions. I can write up a Perl script, but it seems such a fundimental task for an OS to do (Red Hat 6.0).
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Search and replace can be done with perl, sed, or awk on the command line.
sed 's/regexp/replacement/g' input.file > output.file

This say to search the file input.file for the regular expression and substitute the replacement string then write the results to output.file. The g option means global - substitue every occurance, not just the first.

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Using sed you can also specify more than one search/replace couple, but the input file will be re-read from beginning to end for each couple.

That behaviuor leads to unexpteced result if a replace part of a couple is present in the search part of another couple.

search xx, substitute with yy
search yy, substitute with zz

Result: all xx occurrences AND all yy occurrences replaced with zz

To avoid this I developed a program that can do multiple search/replace in a SINGLE PASS. It is called 'opmsr' an acronym for One Pass Multiple Search Replace. You can download it from my home page at the following URL:

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