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docs: Expand math for bash users a bit

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Also fix some awkward typos.
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Fabian Homborg 2021-11-03 17:23:36 +01:00
parent 3abe21708d
commit a4adda5da8
2 changed files with 12 additions and 4 deletions
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12
doc_src/fish_for_bash_users.rst
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@ -73,6 +73,8 @@ See :ref:`Shell variables <variables>` for more.
.. [#] zsh also does not perform word splitting by default (the SH_WORD_SPLIT option controls this) .. [#] zsh also does not perform word splitting by default (the SH_WORD_SPLIT option controls this)
.. _bash-globs:
Wildcards (globs) Wildcards (globs)
----------------- -----------------
@ -221,16 +223,22 @@ Fish does not have ``$((i+1))`` arithmetic expansion, computation is handled by
math $i + 1 math $i + 1
It can handle floating point numbers:: Unlike bash's arithmetic, it can handle floating point numbers::
> math 5 / 2 > math 5 / 2
2.5 2.5
And also hase some functions, like for trigonometry:: And also has some functions, like for trigonometry::
> math cos 2 x pi > math cos 2 x pi
1 1
You can pass arguments to ``math`` separately like above or in quotes. Because fish uses ``()`` parentheses for :ref:`command substitutions <bash-command-substitutions>`, quoting is needed if you want to use them in your expression::
> math '(5 + 2) * 4'
Both ``*`` and ``x`` are valid ways to spell multiplication, but ``*`` needs to be quoted because it looks like a :ref:`glob <bash-globs>`.
Prompts Prompts
------- -------

4
doc_src/language.rst
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@ -564,8 +564,8 @@ That means quoting isn't the absolute necessity it is in other shells. Most of t
.. [#] Unlike bash or zsh, which will join with the first character of $IFS (which usually is space). .. [#] Unlike bash or zsh, which will join with the first character of $IFS (which usually is space).
Derefencing variables Dereferencing variables
''''''''''''''''''''' '''''''''''''''''''''''
The ``$`` symbol can also be used multiple times, as a kind of "dereference" operator (the ``*`` in C or C++), like in the following code:: The ``$`` symbol can also be used multiple times, as a kind of "dereference" operator (the ``*`` in C or C++), like in the following code::