set: set [--abefhkmnptuvxBCHP] [-o option-name] [arg ...]

Set or unset values of shell options and positional parameters.

Change the value of shell attributes and positional parameters, or display the names and values of shell variables.

Options
-a Mark variables which are modified or created for export. -b Notify of job termination immediately. -e Exit immediately if a command exits with a non-zero status. -f Disable file name generation (globbing). -h Remember the location of commands as they are looked up. -k All assignment arguments are placed in the environment for a

command, not just those that precede the command name. -m Job control is enabled. -n Read commands but do not execute them. -o option-name

Set the variable corresponding to option-name:

allexport same as -a braceexpand same as -B emacs use an emacs-style line editing interface errexit same as -e errtrace same as -E functrace same as -T hashall same as -h histexpand same as -H history enable command history ignoreeof the shell will not exit upon reading EOF interactive-comments

allow comments to appear in interactive commands keyword same as -k monitor same as -m noclobber same as -C noexec same as -n noglob same as -f nolog currently accepted but ignored notify same as -b nounset same as -u onecmd same as -t physical same as -P pipefail the return value of a pipeline is the status of

the last command to exit with a non-zero status, or zero if no command exited with a non-zero status posix change the behavior of bash where the default

operation differs from the Posix standard to match the standard privileged same as -p verbose same as -v vi use a vi-style line editing interface xtrace same as -x -p Turned on whenever the real and effective user ids do not match.

Disables processing of the $ENV file and importing of shell functions. Turning this option off causes the effective uid and gid to be set to the real uid and gid. -t Exit after reading and executing one command. -u Treat unset variables as an error when substituting. -v Print shell input lines as they are read. -x Print commands and their arguments as they are executed. -B the shell will perform brace expansion -C If set, disallow existing regular files to be overwritten

by redirection of output. -E If set, the ERR trap is inherited by shell functions. -H Enable ! style history substitution. This flag is on

by default when the shell is interactive. -P If set, do not follow symbolic links when executing commands

such as cd which change the current directory. -T If set, the DEBUG trap is inherited by shell functions.

Using + rather than - causes these flags to be turned off. The flags can also be used upon invocation of the shell. The current set of flags may be found in $-. The remaining n ARGs are positional parameters and are assigned, in order, to $1, $2, .. $n. If no ARGs are given, all shell variables are printed.

Exit Status:
Returns success unless an invalid option is given.