bash [long-opt] [-ir] [-abefhkmnptuvxdBCDHP] [-o option] [-O shopt_option] [argument ...] bash [long-opt] [-abefhkmnptuvxdBCDHP] [-o option] [-O shopt_option] -c string [argument ...] bash [long-opt] -s [-abefhkmnptuvxdBCDHP] [-o option] [-O shopt_option] [argument ...]
In addition to the single-character shell command-line options (see The Set Builtin), there are several multi-character options that you can use. These options must appear on the command line before the single-character options to be recognized.
extdebugoption to the
shoptbuiltin) and shell function tracing (see The Set Builtin for a description of the
gettextPO (portable object) file format. Equivalent to -D except for the output format.
There are several single-character options that may be supplied at
invocation which are not available with the
POSIX(see Locale Translation). This implies the -n option; no commands will be executed.
shoptbuiltin (see The Shopt Builtin). 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
shoptare printed on the standard output. If the invocation option is +O, the output is displayed in a format that may be reused as input.
--signals the end of options and disables further option processing. Any arguments after the
--are treated as filenames and arguments.
A login shell is one whose first character of argument zero is ‘-’, or one invoked with the --login option.
An interactive shell is one started without non-option arguments,
unless -s is specified,
without specifying the -c option, and whose input and output are both
connected to terminals (as determined by
isatty(3)), or one
started with the -i option. See Interactive Shells, for more
If arguments remain after option processing, and neither the
-c nor the -s
option has been supplied, the first argument is assumed to
be the name of a file containing shell commands (see Shell Scripts).
When Bash is invoked in this fashion,
is set to the name of the file, and the positional parameters
are set to the remaining arguments.
Bash reads and executes commands from this file, then exits.
Bash's exit status is the exit status of the last command executed
in the script. If no commands are executed, the exit status is 0.