MIAOU-BASH is a collection of scripts and configurations designed to enhance your terminal experience. As the name suggests, it is built on Bash and is designed to work on most modern GNU/Linux systems.

870 B

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Bash Tips

prevent last false

function body should not end up with a ternary statement

wrong last

Compound of 2 'false' statement returns false.

[[ : ]] && [[ : ]]

right last

[[ : ]] && [[ : ]] || true

arithmetic issue

last (++) statement does not complete successfully!

wrong ++

count=0
(( ++count )) # ok 
(( ++count )) # last statement in function returns false

right ++

count=0
count=$((count+1))

properly grab $?

prefer plain command rather than ! command otherwise you will miss out the exit code

wrong if

  if ! command; then
    local code=$?
    >&2 echo $code # => 0
  fi

right if

  if command; then
    : # useful for preserving $?
  else
    local code=$?
    >&2 echo $code
  fi

870 B Raw Blame History