37 lines
1.8 KiB
HTML
37 lines
1.8 KiB
HTML
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---
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layout: page
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category_title: Intermediate commands
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category-page: intermediate
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tags: bash shell terminal
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author: Marco Farace
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title: bash
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---
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<p>Bash is an sh-compatible command language interpreter that executes commands
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read from the standard input or from a file. Bash also incorporates useful
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features from the Korn and C shells (ksh and csh). Bash is intended to be a
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conformant implementation of the Shell and Utilities portion of the IEEE POSIX
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specification (IEEE Standard 1003.1).</p>
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<h3> Flags </h3>
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<ul>
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<li>-c: If this option is present, then commands are read from
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string. If there are arguments after the string, they are
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assigned to the positional parameters, starting with $0.</li>
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<li>-i: If this option is present, the shell is interactive.</li>
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<li>-l: Make bash act as if it had been invoked as a login shell</li>
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<li>-r: If this option is present, the shell becomes restricted</li>
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<li>-s: If this option is present, or if no arguments remain after
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option processing, then commands are read from the standard
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input. This option allows the positional parameters to be
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set when invoking an interactive shell.</li>
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<li>-s: List only the name, line and time fields. This is the default.</li>
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<li>-T: Print a character after the user name indicating the state of the
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terminal line: `+' if the terminal is writable; `-' if it is not;
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and `?' if a bad line is encountered.</li>
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<li>-u: Print the idle time for each user, and the associated process ID.</li>
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<li>am I: Returns the invoker's real user name.</li>
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<li>file: By default, who gathers information from the file /var/run/utmpx.
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An alternative file may be specified.</li>
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</ul>
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