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I often need to add a timestamp to a file, but I never seem to remember the exact format string that has to be passed to the date command to get a compact datetime string like 20090220T231410 (i.e yyyymmddThhmmss, the ISO 8601 format popular outside the US)
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This can be easier to look at in ls output. Not as clean as +%Y%m%dT%H%M%S, but quicker to write.
If you can do better, submit your command here.
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