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docs/data/reusables/actions/supported-shells.md

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| Supported platform | `shell` parameter | Description | Command run internally |
| ------------------ | ----------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------- |
| Linux / macOS | unspecified | The default shell on non-Windows platforms. Note that this runs a different command to when `bash` is specified explicitly. If `bash` is not found in the path, this is treated as `sh`. | `bash -e {0}` |
| All | `bash` | The default shell on non-Windows platforms with a fallback to `sh`. When specifying a bash shell on Windows, the bash shell included with Git for Windows is used. | `bash --noprofile --norc -eo pipefail {0}` |
| All | `pwsh` | The PowerShell Core. {% data variables.product.prodname_dotcom %} appends the extension `.ps1` to your script name. | `pwsh -command ". '{0}'"` |
| All | `python` | Executes the python command. | `python {0}` |
| Linux / macOS | `sh` | The fallback behavior for non-Windows platforms if no shell is provided and `bash` is not found in the path. | `sh -e {0}` |
| Windows | `cmd` | {% data variables.product.prodname_dotcom %} appends the extension `.cmd` to your script name and substitutes for `{0}`. | `%ComSpec% /D /E:ON /V:OFF /S /C "CALL "{0}""`. |
| Windows | `pwsh` | This is the default shell used on Windows. The PowerShell Core. {% data variables.product.prodname_dotcom %} appends the extension `.ps1` to your script name. If your self-hosted Windows runner does not have _PowerShell Core_ installed, then _PowerShell Desktop_ is used instead. | `pwsh -command ". '{0}'"`. |
| Windows | `powershell` | The PowerShell Desktop. {% data variables.product.prodname_dotcom %} appends the extension `.ps1` to your script name. | `powershell -command ". '{0}'"`. |