fish.txt

# Switching shells
* add /opt/local/bin/fish to /etc/shells
chsh -s /opt/local/bin/fish
chsh -s /bin/bash

# Variables
set name 'value'
set -e name // delete variable
set -x name // export variable
set PATH $PATH /extra/path  // append

# Lists
set LIST 1 2 3
echo $LIST[1] -> 1 // 1 is first index
echo $LIST[-1] -> 3
echo $LIST[1..2] -> 1 2
echo $LIST[-1..1] -> 3 2 1

## Lists are expanded to cartesian product
set LIST1 1 2 3
set LIST2 a b c
echo $LIST1$LIST2 -> 1a 2a 3a 1b 2b 3b 1c 2c 3c
echo "$LIST1$LIST2" -> 1 2 3abc
echo $LIST1 $LIST2 -> 1 2 3 a b c


# for loops
for val in $MYLIST
  echo $val
end


# command substitution
* put in parenthesis: (COMMAND)
set os (uname)


# if else
if grep foo file.txt
  foo
else if test $VAE -eq 1
  ...
else if [ $VAR -eq 2 ]
  ...
end

## test command
if test STATEMENT
else if [ STATEMENT ]

### comparing numbers
  $VAR -eq 1  // equal
  $VAR -ne 1  // not equal
  $VAR -gt 1  // greater than
  $VAR -ge 1  // greater equal

### comparing strings
  $VAR = "foo"
  $VAR != "foo"


# functions
functions // list all functions
functions ls // show code of function
funcsave ls // save function as file in fish/functions

function my_function
  set arg1 $argv[1]
  set arg2 $argv[2]
end