This:
date +%s
will return the number of seconds since the epoch.
This:
date +%s%N
returns the seconds and current nanoseconds.
So:
date +%s%N | cut -b1-13
will give you the number of milliseconds since the epoch – current seconds plus the left three of the nanoseconds.
and from MikeyB – echo $(($(date +%s%N)/1000000)) (dividing by 1000 only brings to microseconds)
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