Man1 - sleep.1

sleep - delay for a specified amount of time

sleep NUMBER[/SUFFIX/]…
sleep OPTION

Pause for NUMBER seconds. SUFFIX may be ’s’ for seconds (the default), ’m’ for minutes, ’h’ for hours or ’d’ for days. NUMBER need not be an integer. Given two or more arguments, pause for the amount of time specified by the sum of their values.

–help

display this help and exit

–version

output version information and exit

Written by Jim Meyering and Paul Eggert.

GNU coreutils online help: https://www.gnu.org/software/coreutils/
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Copyright © 2021 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later https://gnu.org/licenses/gpl.html.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

sleep(3)

Full documentation https://www.gnu.org/software/coreutils/sleep
or available locally via: info ’(coreutils) sleep invocation’