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docs: Document sets $status peculiarities harder

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Fabian Homborg 2020-11-20 16:07:22 +01:00
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18
doc_src/cmds/set.rst
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@ -86,7 +86,14 @@ In erase mode, if variable indices are specified, only the specified slices of t
``set`` requires all options to come before any other arguments. For example, ``set flags -l`` will have the effect of setting the value of the variable ``flags`` to '-l', not making the variable local.
In assignment mode, ``set`` does not modify the exit status. This allows simultaneous capture of the output and exit status of a subcommand, e.g. ``if set output (command)``. In query mode, the exit status is the number of variables that were not found. In erase mode, ``set`` exits with a zero exit status in case of success, with a non-zero exit status if the commandline was invalid, if any of the variable was write-protected or if any of the variable did not exist.
Exit status
-----------
In assignment mode, ``set`` does not modify the exit status, but passes along whatever $status was set, including by command substitutions. This allows capturing the output and exit status of a subcommand, like in ``if set output (command)``.
In query mode, the exit status is the number of variables that were not found.
In erase mode, ``set`` exits with a zero exit status in case of success, with a non-zero exit status if the commandline was invalid, if any of the variable was write-protected or if any of the variable did not exist.
Examples
@ -119,6 +126,15 @@ Examples
echo "Python is at $python_path"
end
# Setting a variable doesn't modify $status!
false
set foo bar
echo $status # prints 1, because of the "false" above.
true
set foo banana (false)
echo $status # prints 1, because of the "(false)" above.
# Like other shells, fish 3.1 supports this syntax for passing a variable to just one command:
# Run fish with a temporary home directory.
HOME=(mktemp -d) fish