functions

function definition

function foo {
    echo "this is a simple function"
}

function definition

foo() {
    echo "this is a simple function"
}

compact function

foo() { echo "this is a compact function"; echo; }

exclusively defined function

if [ $(id -u) = 0 ]; then
  root_exclusive() { echo "this is an exclusive function (root only)"; }
fi  

conditionally defined function

[ $(id -u) = 0 ] && amiroot() { echo "i am root"; } || amiroot() { echo "i am not root"; }

function with explicit return status

foo() { return 0; }

function with implicit return status ($? of last command)

foo() { echo "this will return 0 as well"; }

function with result

foo() { echo "result"; }
result=$(foo)

function with arguments (starting with 1)

foo() {
    local arg1="$1"
    echo "first argument: $arg1"
    echo "other arguments: $2 $3 ..."
}

check if arg is passed

foo() {
    [ -n "$1" ] || return
}

function variables

foo() {
    echo "number of function args: $#"
    echo "args (as single string): $*"
    echo "args (as separate strings): $@"
}

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last updated: Sat Aug 12 14:29:24 2023