Add notes about environment variables to readme (#1229)
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README.md
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README.md
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This readme is also available as a [book](https://just.systems/man/en/);
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This readme is also available as a [book](https://just.systems/man/en/);
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(中文文档在 [这里](README.中文.md), 快看过来!)
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(中文文档在 [这里](https://github.com/casey/just/blob/master/README.中文.md), 快看过来!)
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Commands, called recipes, are stored in a file called `justfile` with syntax inspired by `make`:
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Commands, called recipes, are stored in a file called `justfile` with syntax inspired by `make`:
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@ -1594,6 +1594,22 @@ foo:
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echo $x
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echo $x
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```
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```
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### Sharing Environment Variables Between Recipes
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Each line of each recipe is executed by a fresh shell, so it is not possible to share environment variables between recipes.
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#### Using Python Virtual Environments
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Some tools, like [Python's venv](https://docs.python.org/3/library/venv.html), require loading environment variables in order to work, making them challenging to use with `just`. As a workaround, you can execute the virtual environment binaries directly:
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```make
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venv:
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[ -d foo ] || python3 -m venv foo
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run: venv
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./foo/bin/python3 main.py
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```
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### Changing the Working Directory in a Recipe
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### Changing the Working Directory in a Recipe
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Each recipe line is executed by a new shell, so if you change the working directory on one line, it won't have an effect on later lines:
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Each recipe line is executed by a new shell, so if you change the working directory on one line, it won't have an effect on later lines:
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