Shell-script: timestamp

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A one-liner function that, when piped with the output of another command, prepends each line of that command’s output with a timestamp.

Very useful with commands that output a series of lines periodically but without a timestamp (like vmstat), so that you can’t just send their output to a file and go back to it later without a timeframe.

$ function timestamp { while read l; do d=`date +%H:%M:%S`; echo -e "$d $l"; done; }
$ vmstat 1 | timestamp 12:17:03 procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- 12:17:03 r b swpd free buff cache si so bi bo in cs us sy id wa 12:17:03 1 0 4 16740 42816 395164 0 0 6 5 174 11 3 1 96 0 12:17:04 0 0 4 16656 42816 395184 0 0 0 0 393 510 1 1 98 0 12:17:05 0 0 4 16656 42816 395184 0 0 0 0 391 781 2 1 98 0 12:17:06 1 0 4 16656 42824 395176 0 0 0 84 462 976 3 1 95 0 12:17:07 0 0 4 16656 42824 395184 0 0 0 0 433 1545 11 3 86 0 12:17:08 0 0 4 16656 42824 395184 0 0 0 0 356 807 1 2 97 0

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