fish shell

# Universal. -U, --universal で定義
set -U fish_user_paths . $fish_user_paths

# Global. -g, --global で定義
set -g PATH $HOME/bin $PATH

begin
  # Local. -l, --local で定義
  set -l pirate 'There be treasure in them thar hills'
end

echo $pirate # pirateはlocalなので何も出力されない

contains [OPTIONS] KEY [VALUES...]

# PATHにまだ含まれていなければ追加
if not contains $HOME/bin $PATH
  set PATH $HOME/bin $PATH
end

eval [COMMANDS...]

set cmd ls \| cut -c 1-12
eval $cmd

function NAME [OPTIONS]; BODY; end

function ll
    ls -l $argv
end

functions [ -a | --all ] [ -n | --names ]
functions [ -D | --details ] [ -v ] FUNCTION
functions -c OLDNAME NEWNAME
functions -d DESCRIPTION FUNCTION
functions [ -e | -q ] FUNCTIONS...

functions -n
# Displays a list of currently-defined functions

functions -c foo bar
# Copies the 'foo' function to a new function called 'bar'

functions -e bar
# Erases the function ``bar``

if CONDITION; COMMANDS_TRUE...;
[else if CONDITION2; COMMANDS_TRUE2...;]
[else; COMMANDS_FALSE...;]
end

if test -f foo.txt
    echo foo.txt exists
else if test -f bar.txt
    echo bar.txt exists
else
    echo foo.txt and bar.txt do not exist
end

set [SCOPE_OPTIONS]
set [OPTIONS] VARIABLE_NAME VALUES...
set [OPTIONS] VARIABLE_NAME[INDICES]... VALUES...
set ( -q | --query ) [SCOPE_OPTIONS] VARIABLE_NAMES...
set ( -e | --erase ) [SCOPE_OPTIONS] VARIABLE_NAME
set ( -e | --erase ) [SCOPE_OPTIONS] VARIABLE_NAME[INDICES]...
set ( -S | --show ) [VARIABLE_NAME]...

# Prints all global, exported variables.
set -xg

# Sets the value of the variable $foo to be 'hi'.
set foo hi

# $fooを配列と見なして"there"をappendする
set -a foo there

# Does the same thing as the previous two commands the way it would be done pre-fish 3.0.
set foo hi
set foo $foo there

# 先頭に要素を追加
set foo "Hello, " $foo

# Removes the variable $smurf
set -e smurf

# Changes the fourth element of the $PATH list to ~/bin
set PATH[4] ~/bin

# PATH変数の3つ目を削除
set -e PATH[3]

# 1
source FILENAME [ARGUMENTS...]

# 2
somecommand | source

# 1
test [EXPRESSION]

# 2
[ [EXPRESSION] ]

if test -d /tmp
    cp /etc/motd /tmp/motd
end

if test -n "$MANPATH"
    echo $MANPATH
end

if ! test -r secret.txt
    echo "Can't read secret.txt" >&2
end

if test \( -f /foo -o -f /bar \) -a \( -f /baz -o -f /bat \)
    echo Success
end

if test $status -ne 0
    echo "Previous command failed"
end

# oh-my-fishのテーマをfisherでインストール
fisher add oh-my-fish/theme-<テーマ名>