In array operator in bash

Question

Is there a way to test whether an array contains a specified element?

e.g., something like:

array=(one two three)

if [ \"one\" in ${array} ]; then
...
f         


        

Answer 1

in_array() {
    local needle=$1 el
    shift
    for el in "$@"; do
        if [ "$el" = "$needle" ]; then
            return 0
        fi
    done
    return 1
}

if in_array 1 1 2 3; then
    echo true
else
    echo false
fi

# alternatively
a=(1 2 3)
if in_array 1 "${a[@]}"; then
...