Only pipe STDERR output in `bash` with timestamp

Only pipe STDERR output in bash with timestamp


In order to discard standard output and only log the standard error, following command can be used. The second part of command is to prefix the current timestamp in the output

sh monitor 2>&1>/dev/null | ts '[%Y-%m-%d %H:%M:%S]'


If need to run in dash, such as running in crontab, above syntax is wrong, use following command instead

sh monitor 3>&1 1>/dev/null 2>&3 3>&- | ts '[%Y-%m-%d %H:%M:%S]'

Note: This command can be run in bash too


Prepending a timestamp to each line of output from a command
Pipe only STDERR through a filter

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