| -a |
Export all variables assigned to. |
| -c |
Pass the string argument to the
shell to be interpreted as input. Keep in mind that this option
only accepts a single string as its argument, hence multi-word
strings must be quoted. |
| -C |
Don't overwrite existing files with
``>.'' |
| -e |
If not interactive, exit immediately
if any untested command fails. The exit status of a command is
considered to be explic- itly tested if the command is used to
control an if, elif, while, or until; or if the command is the
left hand operand of an ``&&'' or ``||'' operator. |
| -E |
Enable the built-in emacs
command line editor (disables -V if it has been set). |
| -f |
Disable pathname expansion. |
| -h |
Makes all commands use tracked
aliases. |
| -i |
Force the shell to behave
interactively. |
| -I |
Ignore EOF's from input when
interactive. |
| -k |
tells the shell to use
Korn-compatible behavior in any case where the POSIX.2 behavior
is different from the behavior specified by Korn. In particular,
this affects the trap command. |
| -m |
Turn on job control (set
automatically when interactive). |
| -n |
If not interactive, read commands
but do not execute them. This is useful for checking the syntax
of shell scripts. |
| -p |
Turn on privileged mode. This mode
is enabled on startup if either the effective user or group id
is not equal to the real user or group id. Turning this mode off
sets the effective user and group ids to the real user and group
ids. Also on interactive shells and when enabled, this mode
sources /etc/suid_profile (in- stead of ~/.profile)
after /etc/profile and ignores the contents of the ENV
variable. |
| -r |
Invokes a restricted shell. In a
restricted shell, you cannot do any of the following: use the cd
command; change the values of the variables env, path or shell;
use > or >> to redirect output;
specify command names containing /. These restrictions
do not apply during execution of profile files. |
| -s |
Read commands from standard input
(set automatically if no file arguments are present). This
option has no effect when set after the shell has already
started running (i.e. with set). |
| -t |
Exits after reading and executing
one command. |
| -T |
When waiting for a child, execute
traps immediately. If this option is not set, traps are executed
after the child exits, as specified in IEEE Std1003.2
(``POSIX'') This nonstandard option is useful to put guarding
shells around childs that block signals. The surrounding shell
may kill the child or it may just re- turn control to the tty
and leave the child alone. |
| -u |
Write a message to standard error
when attempting to expand a variable that is not set, and if the
shell is not interactive, exit immediately. |
| -v |
The shell writes its input to
standard error as it is read. Useful for debugging. |
| -V |
Enable the built-in vi
command line editor (disables -E if it has been set). |
| -x |
Write each command to standard error
(preceded by a '+ ') before it is executed. Useful for
debugging. |
