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Should be a bit more portable since echo -e/n and date's -Ins are not.
There are 3 alternatives - vote for the best!
This is useful when watching a log file that does not contain timestamps itself.
If the file already has content when starting the command, the first lines will have the "wrong" timestamp when the command was started and not when the lines were originally written.
If you can do better, submit your command here.
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