# 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 ] FUNCTIONS...

## 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 OLDNAME NEWNAME` or `--copy OLDNAME NEWNAME` creates a new function named NEWNAME, using the definition of the OLDNAME function.

- `-d DESCRIPTION` 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.

- `-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 stdin, `-` 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.) If the `--verbose` option is also specified then five lines are written:

  > - the pathname as already described,

  > - `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.

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` will make some output more verbose.

- `-H` or `--handlers` will show all event handlers.

- `-t` or `--handlers-type TYPE` will show all event handlers matching the given type

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.