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NAMEsu - run a command with substitute user and group IDSYNOPSISsu [options...] [-] [user [args...]]DESCRIPTIONsu allows to run commands with substitute user and group ID.When called without arguments su defaults to running an interactive shell as root. For backward compatibility su defaults to not change the current directory and to only set the environment variables HOME and SHELL (plus USER and LOGNAME if the target user is not root). It is recommended to always use the --login option (instead it's shortcut -) to avoid side effects caused by mixing environments. This version of su uses PAM for authentication, account and session management. Some configuration options found in other su implementations such as e.g. support of a wheel group have to be configured via PAM. OPTIONS
CONFIG FILESsu reads the /etc/default/su and /etc/login.defs configuration files. The following configuration items are relevant for su(1):FAIL_DELAY (number) Delay in seconds in case of authentication failure.
Number must be a non-negative integer.
ENV_PATH (string) Defines the PATH environment variable for a regular user.
The default value is /usr/local/bin:/bin:/usr/bin.
ENV_ROOTPATH (string)
Defines the PATH environment variable for root. The
default value is
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin.
ALWAYS_SET_PATH (boolean) If set to yes and --login and
--preserve-environment were not specified su initializes
PATH.
EXIT STATUSsu normally returns the exit status of the command it executed. If the command was killed by a signal, su returns the number of the signal plus 128.Exit status generated by su itself:
FILES
SEE ALSOrunuser(8), pam(8), shells(5), login.defs(5)AUTHORDerived from coreutils' su which was based on an implementation from David MacKenzie.AVAILABILITYThe su command is part of the util-linux package and is available from Linux Kernel Archive.
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