41 lines
1.7 KiB
HTML
41 lines
1.7 KiB
HTML
---
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layout: page
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category-page: intermediate
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category-title: Intermediate commands
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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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previous-page: pages/cmd/interm/basename.html
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next-page: pages/cmd/interm/cat.html
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---
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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).<br>
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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.
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</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.
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</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.
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</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.
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</li>
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</ul>
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