bash/invocation

• Invocation Modes

• Login Shell

-c [options] -- CommandString [ARG0 [ARG...]]

• commands are read from the first non-option argument (required)

• $0 is set as the second non-option argument defaulting to "bash"

• all remaining non-option arguments are assigned to the positional parameters starting at $1

• [[ $- =~ c ]] will return true

-i [options]

• force the shell into Interactive Mode

• [[ $- =~ i ]] will return true

• [[ ${PS1+set} = 'set' ]] will return true

-r

• act as a Restricted Shell

-s [options] -- [ARG0 [ARG...]]

-D | --dump-strings

• 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 ShoptOption | +O ShoptOption

• 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.

--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).
• These options must appear on the command line before the single-character options to be recognized.

--dump-po-strings

• Equivalent to -D, but the output is in the GNU gettext po (portable object) file format.
• These options must appear on the command line before the single-character options to be recognized.

-D | --dump-strings

• 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.

--help

• Display a usage message on standard output and exit successfully.
• These options must appear on the command line before the single-character options to be recognized.

--rcfile FILE | --init-file FILE

• Execute commands from file instead of the standard personal initialization file ~/.bashrc if the shell is interactive (see INVOCATION below).
• An argument of --init-file is equivalent to --rcfile.
• These options must appear on the command line before the single-character options to be recognized.

-l | --login

• act as a Login Shell

• --login must appear on the command line before the single-character options to be recognized.

--noediting

• Do not use the GNU readline library to read command lines when the shell is interactive.
• These options must appear on the command line before the single-character options to be recognized.

--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).
• These options must appear on the command line before the single-character options to be recognized.

--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.
• These options must appear on the command line before the single-character options to be recognized.

--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.
• These options must appear on the command line before the single-character options to be recognized.

-r | --restricted

• act as a Restricted Shell