systemctl-help
Show the manual pages for one or more units, or for the unit a process belongs to (by PID). tldr-pages
On Linux
Linux
Show the manual page for a specific unit
systemctl help unitIdentifyShow the manual pages for multiple units
systemctl help unit1 unit2 ...IdentifyShow the manual page for a user unit
systemctl help unit --userIdentifyShow the manual page without a pager (all at once)
systemctl help unit --no-pagerIdentifyShow the manual page for the unit of a process by PID
systemctl help process_idIdentify