options arg1 arg2 ...]
With no arguments, set prints the values of all variables known to the current shell. Options can be enabled (-option) or disabled (+option). Options can also be set when the shell is invoked. (See the section Invoking the Shell in Invoking the Shell.) Arguments are assigned in order to $1, $2, etc.
From now on, automatically mark variables for export after defining or changing them.
Print job completion messages as soon as jobs terminate; don’t wait until the next prompt.
Enable brace expansion. On by default.
Prevent overwriting via > redirection; use >| to overwrite files.
Exit if a command yields a nonzero exit status. The ERR trap executes before the shell exits.
Cause shell functions, command substitutions, and subshells to inherit the ERR trap.
Ignore filename metacharacters (e.g., * ? [ ]).
Locate and remember commands as they are defined. On by default.
Enable csh-style (!-style) history substitution. On by default.
Assignment of environment variables (var=value) takes effect regardless of where they appear on the command line. Normally, assignments must precede the command name.
Enable job control; background jobs execute in a separate process group. -m is usually on by default.
Read commands but don’t execute; useful for checking syntax. Ignored if the shell is interactive.
- +o [mode]
With mode, disable the given shell option. Plain set +o prints the settings of all the current options in a form that can be reread ...