All of the single-character shell options documented in the
description of the set builtin command, including -o, can be used
as options when the shell is invoked. In addition, bash
interprets the following options when it is invoked:
-c If the -c option is present, then commands are read from
the first non-option argument command_string. If there
are arguments after the command_string, the first argument
is assigned to $0 and any remaining arguments are assigned
to the positional parameters. The assignment to $0 sets
the name of the shell, which is used in warning and error
messages.
-i If the -i option is present, the shell is interactive.
-l Make bash act as if it had been invoked as a login shell
(see INVOCATION below).
-r If the -r option is present, the shell becomes restricted
(see RESTRICTED SHELL below).
-s If the -s option is present, or if no arguments remain
after option processing, then commands are read from the
standard input. This option allows the positional
parameters to be set when invoking an interactive shell or
when reading input through a pipe.
-D A list of all double-quoted strings preceded by $ is
printed on the standard output. These are the strings
that are subject to language translation when the current
locale is not C or POSIX. This implies the -n option; no
commands will be executed.
[-+]O [shopt_option]
shopt_option is one of the shell options accepted by the
shopt builtin (see SHELL BUILTIN COMMANDS below). If
shopt_option is present, -O sets the value of that option;
+O unsets it. If shopt_option is not supplied, the names
and values of the shell options accepted by shopt are
printed on the standard output. If the invocation option
is +O, the output is displayed in a format that may be
reused as input.
-- A -- signals the end of options and disables further
option processing. Any arguments after the -- are treated
as filenames and arguments. An argument of - is
equivalent to --.
Bash also interprets a number of multi-character options. These
options must appear on the command line before the single-
character options to be recognized.
--debugger
Arrange for the debugger profile to be executed before the
shell starts. Turns on extended debugging mode (see the
description of the extdebug option to the shopt builtin
below).
--dump-po-strings
Equivalent to -D, but the output is in the GNU gettext po
(portable object) file format.
--dump-strings
Equivalent to -D.
--help Display a usage message on standard output and exit
successfully.
--init-file file
--rcfile file
Execute commands from file instead of the standard
personal initialization file ~/.bashrc if the shell is
interactive (see INVOCATION below).
--login
Equivalent to -l.
--noediting
Do not use the GNU readline library to read command lines
when the shell is interactive.
--noprofile
Do not read either the system-wide startup file
/etc/profile or any of the personal initialization files
~/.bash_profile, ~/.bash_login, or ~/.profile. By
default, bash reads these files when it is invoked as a
login shell (see INVOCATION below).
--norc Do not read and execute the personal initialization file
~/.bashrc if the shell is interactive. This option is on
by default if the shell is invoked as sh.
--posix
Change the behavior of bash where the default operation
differs from the POSIX standard to match the standard
(posix mode). See SEE ALSO below for a reference to a
document that details how posix mode affects bash's
behavior.
--restricted
The shell becomes restricted (see RESTRICTED SHELL below).
--verbose
Equivalent to -v.
--version
Show version information for this instance of bash on the
standard output and exit successfully.
