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docs: Clarify when exporting is necessary

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See #5920.

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This commit is contained in:
Fabian Homborg 2019-06-04 22:12:11 +02:00
parent 23671f696e
commit 53216940c4
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sphinx_doc_src/index.rst
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@ -1103,7 +1103,7 @@ For example::
Exporting variables
-------------------
Variables in fish can be "exported", so they will be inherited by any commands started by fish.
Variables in fish can be "exported", so they will be inherited by any commands started by fish. In particular, this is necessary for variables used to configure external commands like $LESS or $GOPATH, but also for variables that contain general system settings like $PATH or $LANGUAGE. If an external command needs to know a variable, it needs to be exported.
Variables can be explicitly set to be exported with the ``-x`` or ``--export`` switch, or not exported with the ``-u`` or ``--unexport`` switch. The exporting rules when setting a variable are identical to the scoping rules for variables:
@ -1111,7 +1111,7 @@ Variables can be explicitly set to be exported with the ``-x`` or ``--export`` s
- If a variable is not explicitly set to be exported or not exported, but has been previously defined, the previous exporting rule for the variable is kept.
- Otherwise, the variable will not be exported.
- Otherwise, by default, the variable will not be exported.
- If a variable has local scope and is exported, any function called receives a _copy_ of it, so any changes it makes to the variable disappear once the function returns.