Is there a Unix utility to prepend timestamps to stdin?

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ts from moreutils will prepend a timestamp to every line of input you give it. You can format it using strftime too.

$ echo 'foo bar baz' | ts
Mar 21 18:07:28 foo bar baz
$ echo 'blah blah blah' | ts '%F %T'
2012-03-21 18:07:30 blah blah blah
$

To install it:

sudo apt-get install moreutils

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