sleep(20) - man - phpman

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⚡ TLDR: sleep (tldr-pages)

Delay for a specified amount of time.

Delay in seconds
sleep {{seconds}}
Execute a specific command after 20 seconds delay
sleep 20 && {{command}}

rtcwake (8)          - enter a system sleep state until specified wakeup time
sleep (1)            - delay for a specified amount of time
sleep.conf.d (5)     - Suspend and hibernation configuration file
systemd-hibernate.service (8) - System sleep state logic
systemd-hybrid-sleep.service (8) - System sleep state logic
systemd-sleep (8)    - System sleep state logic
systemd-sleep.conf (5) - Suspend and hibernation configuration file
systemd-suspend-then-hibernate.service (8) - System sleep state logic
systemd-suspend.service (8) - System sleep state logic
Time::HiRes (3perl)  - High resolution alarm, sleep, gettimeofday, interval t...