# functions - print or erase functions

## Synopsis

    functions [-a | --all] [-n | --names]
    functions [-D | --details] [-v] FUNCTION
    functions -c OLDNAME NEWNAME
    functions -d DESCRIPTION FUNCTION
    functions [-e | -q] FUNCTION ...

## Description

`functions` prints or erases functions.

The following options are available:

-a or --all

  Lists all functions, even those whose name starts with an underscore.

-c or --copy OLDNAME NEWNAME

  Creates a new function named NEWNAME, using the definition of the OLDNAME function.

-d or --description DESCRIPTION

  Changes the description of this function.

-e or --erase

  Causes the specified functions to be erased. This also means that it is prevented from autoloading in the current session. Use funcsave to remove the saved copy.

-D or --details

  Reports the path name where the specified function is defined or could be autoloaded, `stdin` if the function was defined interactively or on the command line or by reading standard input, - if the function was created via source, and `n/a` if the function isn’t available. (Functions created via alias will return -, because `alias` uses `source` internally. Copied functions will return where the function was copied.) If the --verbose option is also specified then five lines are written:

  - the path name as already described,

  - if the function was copied, the path name to where the function was originally defined, otherwise `autoloaded`, `not-autoloaded` or `n/a`,

  - the line number within the file or zero if not applicable,

  - `scope-shadowing` if the function shadows the vars in the calling function (the normal case if it wasn’t defined with --no-scope-shadowing), else `no-scope-shadowing`, or `n/a` if the function isn’t defined,

  - the function description minimally escaped so it is a single line, or `n/a` if the function isn’t defined or has no description.

  You should not assume that only five lines will be written since we may add additional information to the output in the future.

--no-details

  Turns off function path reporting, so just the definition will be printed.

-n or --names

  Lists the names of all defined functions.

-q or --query

  Tests if the specified functions exist.

-v or --verbose

  Make some output more verbose.

-H or --handlers

  Show all event handlers.

-t or --handlers-type TYPE

  Show all event handlers matching the given TYPE.

-h or --help

  Displays help about using this command.

The default behavior of `functions`, when called with no arguments, is to print the names of all defined functions. Unless the `-a` option is given, no functions starting with underscores are included in the output.

If any non-option parameters are given, the definition of the specified functions are printed.

Copying a function using `-c` copies only the body of the function, and does not attach any event notifications from the original function.

Only one function’s description can be changed in a single invocation of `functions -d`.

The exit status of `functions` is the number of functions specified in the argument list that do not exist, which can be used in concert with the `-q` option.

## Examples

    functions -n
    # Displays a list of currently-defined functions

    functions -c foo bar
    # Copies the 'foo' function to a new function called 'bar'

    functions -e bar
    # Erases the function ``bar``

## See more

For more explanation of how functions fit into fish, see Functions.