Bash to Fish

bash_to_fish.txt

setting variables
bash: var=value
fish: set var value

function arguments
bash: "$@"
fish: $argv

function local variables
bash: local var
fish: set -l var

conditionals I
bash: [[ ... ]] and [ ... ]
fish: test ...

conditionals II
bash: if cond; then cmds; fi
fish: if cond; cmds; end

conditionals III
bash: cmd1 && cmd2
fish: cmd1; and cmd2

command substitution
bash: output=$(pipeline)
fish: set output (pipeline)

process substitution
bash: join <(sort file1) <(sort file2)
fish: join (sort file1 | psub) (sort file2 | psub)