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102 lines
2.5 KiB
Plaintext
102 lines
2.5 KiB
Plaintext
---
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slug: /faq/
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sidebar_position: 15
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---
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# FAQ
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This page contains a list of frequently asked questions about Task.
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## Why won't my task update my shell environment?
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This is a limitation of how shells work. Task runs as a subprocess of your
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current shell, so it can't change the environment of the shell that started it.
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This limitation is shared by other task runners and build tools too.
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A common way to work around this is to create a task that will generate output
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that can be parsed by your shell. For example, to set an environment variable on
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your shell you can write a task like this:
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```yaml
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my-shell-env:
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cmds:
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- echo "export FOO=foo"
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- echo "export BAR=bar"
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```
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Now run `eval $(task my-shell-env)` and the variables `$FOO` and `$BAR` will be
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available in your shell.
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## I can't reuse my shell in a task's commands
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Task runs each command as a separate shell process, so something you do in one
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command won't effect any future commands. For example, this won't work:
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```yaml
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version: '3'
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tasks:
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foo:
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cmds:
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- a=foo
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- echo $a
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# outputs ""
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```
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To work around this you can either use a multiline command:
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```yaml
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version: '3'
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tasks:
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foo:
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cmds:
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- |
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a=foo
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echo $a
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# outputs "foo"
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```
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Or for more complex multi-line commands it is recommended to move your code into
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a separate file and call that instead:
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```yaml
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version: '3'
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tasks:
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foo:
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cmds:
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- ./foo-printer.bash
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```
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```shell
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#!/bin/bash
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a=foo
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echo $a
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```
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## 'x' builtin command doesn't work on Windows
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The default shell on Windows (`cmd` and `powershell`) do not have commands like
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`rm` and `cp` available as builtins. This means that these commands won't work.
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If you want to make your Taskfile fully cross-platform, you'll need to work
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around this limitation using one of the following methods:
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- Use the `{{OS}}` function to run an OS-specific script.
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- Use something like `{{if eq OS "windows"}}powershell {{end}}<my_cmd>` to
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detect windows and run the command in Powershell directly.
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- Use a shell on Windows that supports these commands as builtins, such as [Git
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Bash][git-bash] or [WSL][wsl].
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We want to make improvements to this part of Task and the issues below track
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this work. Constructive comments and contributions are very welcome!
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- #197
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- [mvdan/sh#93](https://github.com/mvdan/sh/issues/93)
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- [mvdan/sh#97](https://github.com/mvdan/sh/issues/97)
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{/* prettier-ignore-start */}
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[git-bash]: https://gitforwindows.org/
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[wsl]: https://learn.microsoft.com/en-us/windows/wsl/install
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{/* prettier-ignore-end */}
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