Fish equivalent of bash $(command) notation

Question

I am currently trying out the fish shell instead of using bash. One type of notation I'm having trouble learning the fish-equivalent notation for is $(command), similar to how it is described in this SOF post. How do I write this using fish? Keep in mind that I could use backslash characters around the command I want to evaluate, but the linked post and other posts discourage this because it is an old style of evaluating commands.

Specifically, this is the bash command I want to convert to fish syntax (for initializing rbenv during startup of the shell):

eval "$(rbenv init -)"

Per [this](http://fishshell.com/docs/2.0/faq.html#faq-subcommand) entry in the fish FAQ, sub-commands are denoted by surrounding them with parenthesis. e.g., `set foo (echo bar); echo $foo` outputs `bar`. — iscfrc, Oct 06 '13 at 19:50

score 79 · Accepted Answer · edited Sep 24 '21 at 08:21

79

In fish, $ is used only for variables. Correct notation equivalent to bash $(command) is just (command) in fish.

edited Sep 24 '21 at 08:21

BuZZ-dEE

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answered Jan 04 '14 at 08:58

Phlogisto

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`eval (docker-machine env default --no-proxy --shell=fish)` :D thanks for the help too – Leo Cavalcante Jan 17 '17 at 16:18

score 11 · Answer 2 · answered Apr 13 '20 at 15:28

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FYI: If you additionally need to use this inside a string:

echo "Found "(count $PATH)" paths in PATH env var"

answered Apr 13 '20 at 15:28

Jairo Andres Velasco Romero

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So there is no way around temporarily closing the quote and reopening right after. https://fishshell.com/docs/current/tutorial.html#command-substitutions – aasutossh Jun 04 '21 at 15:46

Fish equivalent of bash $(command) notation

2 Answers2