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docs: Some more $() changes

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This commit is contained in:
Fabian Homborg 2021-07-16 18:08:36 +02:00
parent 405a03bfae
commit a6699576ce
2 changed files with 5 additions and 5 deletions
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2
doc_src/fish_for_bash_users.rst
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@ -12,7 +12,7 @@ Many things are similar - they both fundamentally expand commandlines to execute
Command substitutions
---------------------
Fish spells command substitutions as ``(command)`` instead of ``$(command)`` (or ```command```).
Fish spells command substitutions as ``$(command)`` or ``(command)``, but not ```command```.
In addition, it only splits them on newlines instead of $IFS. If you want to split on something else, use :ref:`string split <cmd-string-split>`, :ref:`string split0 <cmd-string-split>` or :ref:`string collect <cmd-string-collect>`. If those are used as the last command in a command substitution the splits they create are carried over. So::

8
doc_src/tutorial.rst
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@ -372,9 +372,9 @@ For more, see :ref:`Lists <variables-lists>`.
Command Substitutions
---------------------
Command substitutions use the output of one command as an argument to another. Unlike other shells, fish does not use backticks `` for command substitutions. Instead, it uses parentheses::
Command substitutions use the output of one command as an argument to another. Unlike other shells, fish does not use backticks `` for command substitutions. Instead, it uses parentheses with or without a dollar::
> echo In (pwd), running (uname)
> echo In (pwd), running $(uname)
In /home/tutorial, running FreeBSD
A common idiom is to capture the output of a command in a variable::
@ -383,9 +383,9 @@ A common idiom is to capture the output of a command in a variable::
> echo $os
Linux
Command substitutions are not expanded within quotes. Instead, you can temporarily close the quotes, add the command substitution, and reopen them, all in the same argument::
Command substitutions without a dollar are not expanded within quotes, so the version with a dollar is simpler::
> touch "testing_"(date +%s)".txt"
> touch "testing_$(date +%s).txt"
> ls *.txt
testing_1360099791.txt