print effective user name NAME whoami - print effective user name SYNOPSIS whoami [ OPTION ]... DESCRIPTION Print the user name......inside the namespace: $ id -u; id -g 1000 1000 $ unshare --user --map-root-user \ sh -c 'whoami; cat /proc/self/uid_map /proc/self/gid_map' root 0 1000 1 0 1000 1 As an unprivil…Control the systemd system and service manager NAME systemctl - Control the systemd system and service manager SYNOPSIS systemctl [OPTIONS...] COMMAND [UNIT...] DESCRIPTION systemc…