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Variable

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Usage

Creating variables

fish

set var_name value
set my_name (read)

Using variables

fish

echo $HOME
echo {$WORD}s
echo "$foo and $bar"

Bash	Fish	Description
`$0`	`status filename`	Filename of current script.
`$*` `$@` `$1`	`$argv`	Script or function arguments.
`$#`	`count $argv`	Number of arguments.
`$?`	`$status`	Return code of last command.
`$!`	`$last_pid`	PID of last program run in background.
`$$`	`$fish_pid`	Current fish PID.
`$-`	`status is-interactive` `status is-login`	Check shell interactivity.

Considering .env an environment file (with KEY=VALUE tuples), one can export those variables in fish using:

fish

export (xargs -L 1 < .env)

Or a more complex solution like:

fish

export (grep -E '^[^#;].+=.*' .env | xargs -L 1)