if unix log file includes no timestamp

http://unix.stackexchange.com/questions/26728/prepending-a-timestamp-to-each-line-of-output-from-a-command

— Not yet tested:
your_command | ts
What if your_command was started by someone else?
Tail -f the.log |ts

–Tested:
tail -f ,trash.log | perl -MPOSIX -pe ‘print strftime (“[%H:%M:%S] “, localtime)’

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