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>Command-Line Options</TITLE
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>Advanced Bash-Scripting Guide: An in-depth exploration of the art of shell scripting</TH
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NAME="COMMAND-LINE-OPTIONS"
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>Appendix F. Command-Line Options</H1
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>Many executables, whether binaries or script files, accept
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options to modify their run-time behavior. For example: from
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the command-line, typing <B
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NAME="STANDARD-OPTIONS"
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>F.1. Standard Command-Line Options</H1
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>Over time, there has evolved a loose standard for the
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meanings of command-line option flags. The GNU utilities conform
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more closely to this <SPAN
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>Traditionally, UNIX command-line options consist of a dash,
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followed by one or more lowercase letters. The GNU utilities
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added a double-dash, followed by a complete word or compound
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>The two most widely-accepted options are:</P
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>: Give usage message and exit.</P
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>: Show program version and exit.</P
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>Other common options are:</P
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information or operate on <SPAN
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>: list files or arguments without
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taking other action.</P
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>: Operate recursively (down
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>: output additional information to
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>: apply compression (usually
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>: filename follows.</P
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>: force overwrite of target file(s).</P
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>Many UNIX and Linux utilities deviate from this
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> so it is dangerous to
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> that a given option will behave in a
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standard way. Always check the man page for the command in question
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>A complete table of recommended options for the GNU utilities
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HREF="http://www.gnu.org/prep/standards/"
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>the GNU standards page</A
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>A Detailed Introduction to I/O and I/O Redirection</TD
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>Bash Command-Line Options</TD
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