Learning the bash shell, 3rd edition by Cameron Newham

Author:Cameron Newham [Cameron Newham]
Language: eng
Format: epub
Tags: Sciences
ISBN: 9780596158965
Published: 2009-02-09T00:00:00+00:00

-a

Displays every built-in and whether it is enabled or not

-d

Deletes a built-in loaded with -f

-f filename

Loads a new built-in from the shared-object filename

-n

Disables a built-in or displays a list of disabled built-ins

-p

Displays a list of all of the built-ins

-s

Restricts the output to POSIX "special" built-ins

Of these options, -n is the most useful; it is used to disable a built-in. enable without an option enables a built-in. More than one built-in can be given as arguments to enable, so enable -n pushd popd dirs would disable the pushd, popd, and dirs built-ins.[13]

You can find out what built-ins are currently enabled and disabled by using the command on its own, or with the -p option; enable or enable -p will list all enabled built-ins, and enable -n will list all disabled built-ins. To get a complete list with their current status, you can use enable -a.

The -s option restricts the output to POSIX `special' built-ins. These are :, ., source, break, continue, eval, exec, exit, export, readonly, return, set, shift, trap, and unset.

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