Fish cheatsheet

cheatsheet.fish

# Get only the name of the current directory
basename $PWD
# ~

# Set an array var
set _shows 'The Office' 'It\'s Always Sunny in Philadelphia'

# For loop
for _show in $_shows
  echo "I love $_show!"
end
# I love The Office!
# I love It's Always Sunny in Philadelphia!

# For loops work inline too!
for _show in $_shows; echo "I love $_show!"; end
# I love The Office!
# I love It's Always Sunny in Philadelphia!

# Iterate on a short list
for _n in {1,2,'three',"four"}; echo $_n; end
# 1
# 2
# three
# four

# List some numbers
seq -w 1 3
# 1
# 2
# 3

# Numbers will pad automagically
seq -w 1 10
# 01
# 02
# 03
# 04
# 05
# 06
# 07
# 08
# 09
# 10

# Loop a statement forever
printf "You sound like "; while true; echo "a broken record." && sleep 1; end
# You sound like 
# a broken record.
# a broken record.
# a broken record.
# ...

# Check whether any args were given, and they're not blank
if set -q argv[1]; and test -n argv[1]
  echo "yeahp"
else
  echo "it's gonna be a no from me, dog"
end
# $ run
# it's gonna be a no from me, dog
# $ run with some text
# yeahp

comm-usage.fish

# Get lines only found in the first file
comm -23 file1 file2

# Get lines only found in the second file
comm -13 file1 file2

# Get common lines to both files
comm -12 file1 file2

# Get common lines from stdin and file1
cat file1 | comm -12 - file2

fish-links.md

• Brace Expansion and Sequences