Table 2.1 and Table 2.2 list the options you can use when invoking bash 2.x and 1.x, respectively. [144]The multicharacter options must appear on the command line before the single-character options. In addition to these, any set option can be used on the command line; see Table 2.6. Login shells are usually invoked with the options -i (interactive), -s (read from standard input), and -m (enable job control).
Table B-1. Command-Line Options
| Option | Meaning |
|---|---|
| -c string |
Commands are read from string, if present. Any arguments after string are interpreted as positional parameters, starting with $0. |
| -D |
A list of all double-quoted strings preceded by $ is printed on the standard ouput. These are the strings that are subject to language translation when the current locale is not C or POSIX. This also turns on the -n option. |
| -i |
Interactive shell. Ignore signals TERM, INT, and QUIT. With job control in effect, TTIN, TTOU, and TSTP are also ignored. |
| -o option |
Takes the same arguments as set -o. |
| -s |
Read commands from the standard input. If an argument is given to bash, this flag takes precedence (i.e., the argument won’t be treated as a script name and standard input will be read). |
| -r |
Restricted shell. See Chapter 10. |
| - |
Signals the end of options and disables further option processing. Any options after this are treated as filenames and arguments. -- is synonymous with -. |
| --dump-strings |
Does the same as -D. |
| --help |
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