chris blogs

July 2013

27jul2013 · Summer of Scripts: spongegrep

spongegrep is like grep, but for whole files: if any line matches the regular expression given, all lines are output:

% utter foo bar baz | spongegrep foo
foo
bar
baz
% utter foo bar baz | spongegrep quux || echo not found
not found

It also supports negation:

% utter foo bar baz | spongegrep -v quux
foo
bar
baz
% utter foo bar baz | spongegrep -v foo

The benefit over using grep -q foo file && cat file is that spongegrep works on streams and doesn’t need rewinding.

A good use is checking logs or command outputs for error messages, and eating them up if nothing worrisome happened (also nice in crontabs):

% sensors | spongegrep ALARM

NP: Fliehende Stürme—Es gibt mich nicht!

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