nushell/docs/commands/which.md

---
title: which
layout: command
version: 0.59.1
---

Finds a program file, alias or custom command.

## Signature

```> which (application) ...rest --all```

## Parameters

 -  `application`: application
 -  `...rest`: additional applications
 -  `--all`: list all executables

## Examples

Find if the 'myapp' application is available
```shell
> which myapp
```
Auto-generate markdown command docs (#4451) * Finish updating * a couple improvements * Update renames * cleanup examples 2022-02-14 03:22:51 +01:00			`---`
			`title: which`
			`layout: command`
fix typo, update some examples and regenerate docs (#4718) 2022-03-04 13:10:09 +01:00			`version: 0.59.1`
Auto-generate markdown command docs (#4451) * Finish updating * a couple improvements * Update renames * cleanup examples 2022-02-14 03:22:51 +01:00			`---`
Rewrite `which` (#1144) * Detect built-in commands passed as args to `which` This expands the built-in `which` command to detect nushell commands that may have the same name as a binary in the path. * Allow which to interpret multiple arguments Previously, it would discard any argument besides the first. This allows `which` to process multiple arguments. It also makes the output a stream of rows. * Use map to build the output * Add boolean column for builtins * Use macros for entry creation shortcuts * Process command args and use async_stream In order to use `ichwh`, I'll need to use async_stream. But in order to avoid lifetime errors with that, I have to process the command args before using them. I'll admit I don't fully understand what is going on with the `args.process(...)` function, but it works. * Use `ichwh` for path searching This commit transitions from `which` to `ichwh`. The path search is now done asynchronously. * Enable the `--all` flag on `which` * Make `which` respect external commands Escaped commands passed to wich (e.g., `which "^ls"`), are now searched before builtins. * Fix clippy warnings This commit resolves two warnings from clippy, in light of #1142. * Update Cargo.lock to get new `ichwh` version `ichwh@0.2.1` has support for local paths. * Add documentation for command 2020-01-01 07:45:27 +01:00
Auto-generate markdown command docs (#4451) * Finish updating * a couple improvements * Update renames * cleanup examples 2022-02-14 03:22:51 +01:00			`Finds a program file, alias or custom command.`
Rewrite `which` (#1144) * Detect built-in commands passed as args to `which` This expands the built-in `which` command to detect nushell commands that may have the same name as a binary in the path. * Allow which to interpret multiple arguments Previously, it would discard any argument besides the first. This allows `which` to process multiple arguments. It also makes the output a stream of rows. * Use map to build the output * Add boolean column for builtins * Use macros for entry creation shortcuts * Process command args and use async_stream In order to use `ichwh`, I'll need to use async_stream. But in order to avoid lifetime errors with that, I have to process the command args before using them. I'll admit I don't fully understand what is going on with the `args.process(...)` function, but it works. * Use `ichwh` for path searching This commit transitions from `which` to `ichwh`. The path search is now done asynchronously. * Enable the `--all` flag on `which` * Make `which` respect external commands Escaped commands passed to wich (e.g., `which "^ls"`), are now searched before builtins. * Fix clippy warnings This commit resolves two warnings from clippy, in light of #1142. * Update Cargo.lock to get new `ichwh` version `ichwh@0.2.1` has support for local paths. * Add documentation for command 2020-01-01 07:45:27 +01:00
Auto-generate markdown command docs (#4451) * Finish updating * a couple improvements * Update renames * cleanup examples 2022-02-14 03:22:51 +01:00			`## Signature`
Rewrite `which` (#1144) * Detect built-in commands passed as args to `which` This expands the built-in `which` command to detect nushell commands that may have the same name as a binary in the path. * Allow which to interpret multiple arguments Previously, it would discard any argument besides the first. This allows `which` to process multiple arguments. It also makes the output a stream of rows. * Use map to build the output * Add boolean column for builtins * Use macros for entry creation shortcuts * Process command args and use async_stream In order to use `ichwh`, I'll need to use async_stream. But in order to avoid lifetime errors with that, I have to process the command args before using them. I'll admit I don't fully understand what is going on with the `args.process(...)` function, but it works. * Use `ichwh` for path searching This commit transitions from `which` to `ichwh`. The path search is now done asynchronously. * Enable the `--all` flag on `which` * Make `which` respect external commands Escaped commands passed to wich (e.g., `which "^ls"`), are now searched before builtins. * Fix clippy warnings This commit resolves two warnings from clippy, in light of #1142. * Update Cargo.lock to get new `ichwh` version `ichwh@0.2.1` has support for local paths. * Add documentation for command 2020-01-01 07:45:27 +01:00
Auto-generate markdown command docs (#4451) * Finish updating * a couple improvements * Update renames * cleanup examples 2022-02-14 03:22:51 +01:00			```> which (application) ...rest --all```
Slightly improve new which command (#1145) 2020-01-01 08:47:25 +01:00
Auto-generate markdown command docs (#4451) * Finish updating * a couple improvements * Update renames * cleanup examples 2022-02-14 03:22:51 +01:00			`## Parameters`
Slightly improve new which command (#1145) 2020-01-01 08:47:25 +01:00
Auto-generate markdown command docs (#4451) * Finish updating * a couple improvements * Update renames * cleanup examples 2022-02-14 03:22:51 +01:00			- `application`: application
			- `...rest`: additional applications
			- `--all`: list all executables
Rewrite `which` (#1144) * Detect built-in commands passed as args to `which` This expands the built-in `which` command to detect nushell commands that may have the same name as a binary in the path. * Allow which to interpret multiple arguments Previously, it would discard any argument besides the first. This allows `which` to process multiple arguments. It also makes the output a stream of rows. * Use map to build the output * Add boolean column for builtins * Use macros for entry creation shortcuts * Process command args and use async_stream In order to use `ichwh`, I'll need to use async_stream. But in order to avoid lifetime errors with that, I have to process the command args before using them. I'll admit I don't fully understand what is going on with the `args.process(...)` function, but it works. * Use `ichwh` for path searching This commit transitions from `which` to `ichwh`. The path search is now done asynchronously. * Enable the `--all` flag on `which` * Make `which` respect external commands Escaped commands passed to wich (e.g., `which "^ls"`), are now searched before builtins. * Fix clippy warnings This commit resolves two warnings from clippy, in light of #1142. * Update Cargo.lock to get new `ichwh` version `ichwh@0.2.1` has support for local paths. * Add documentation for command 2020-01-01 07:45:27 +01:00
			`## Examples`

Auto-generate markdown command docs (#4451) * Finish updating * a couple improvements * Update renames * cleanup examples 2022-02-14 03:22:51 +01:00			`Find if the 'myapp' application is available`
Rewrite `which` (#1144) * Detect built-in commands passed as args to `which` This expands the built-in `which` command to detect nushell commands that may have the same name as a binary in the path. * Allow which to interpret multiple arguments Previously, it would discard any argument besides the first. This allows `which` to process multiple arguments. It also makes the output a stream of rows. * Use map to build the output * Add boolean column for builtins * Use macros for entry creation shortcuts * Process command args and use async_stream In order to use `ichwh`, I'll need to use async_stream. But in order to avoid lifetime errors with that, I have to process the command args before using them. I'll admit I don't fully understand what is going on with the `args.process(...)` function, but it works. * Use `ichwh` for path searching This commit transitions from `which` to `ichwh`. The path search is now done asynchronously. * Enable the `--all` flag on `which` * Make `which` respect external commands Escaped commands passed to wich (e.g., `which "^ls"`), are now searched before builtins. * Fix clippy warnings This commit resolves two warnings from clippy, in light of #1142. * Update Cargo.lock to get new `ichwh` version `ichwh@0.2.1` has support for local paths. * Add documentation for command 2020-01-01 07:45:27 +01:00			```shell
Auto-generate markdown command docs (#4451) * Finish updating * a couple improvements * Update renames * cleanup examples 2022-02-14 03:22:51 +01:00			`> which myapp`
First pass at updating all documentation formatting and cleaning up output of examples (#2031) 2020-06-23 20:21:47 +02:00			```