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Library: GNU bash Command Reference (Darwin 9.0)


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

-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
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 1003.2 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.
-   Assign any remaining arguments to the positional parameters.
The -x and -v options are turned off.

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.

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