date +"%T.%N"
returns the current time with nanoseconds.06:46:41.431857000
date +"%T.%6N"
returns the current time with nanoseconds rounded to the first 6 digits, which is microseconds.06:47:07.183172
date +"%T.%3N"
returns the current time with nanoseconds rounded to the first 3 digits, which is milliseconds.06:47:42.773
In general, every field of the date
command’s format can be given an optional field width.
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