Common Options

Most GNU utilities share the options listed in Table VI-2. The utilities that use these options are marked as such. Almost all POSIX utilities support the and options.

Table VI-2. Common command line options



A single hyphen appearing in place of a filename indicates that the utility will accept standard input in place of the file.

A double hyphen marks the end of the options on a command line. You can follow this option with an argument that begins with a hyphen. Without this option the utility assumes that an argument that begins with a hyphen is an option.


Displays a help message for the utility.


Displays version information for the utility.

A Practical Guide to UNIX[r] for Mac OS[r] X Users
A Practical Guide to UNIX for Mac OS X Users
ISBN: 0131863339
EAN: 2147483647
Year: 2005
Pages: 234

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