array_unique.sh.md

array_unique

array_unique -- Removes duplicated elements from an array variable.

array_unique sorts elements first and removes duplicated elements. Function form applies array_unique to the given variable. Stream form applies array_unique to every line. Every line is treated as elements.

Usage

// 1. Function form.
void func::array_unique(string[]* variable)
// 2. Stream form.
void stream::array_unique() < input > output

Examples

a=(c b a b)
func::array_unique a
echo "${a[@]}"  # => a b c

echo c b a b | stream::array_unique  # => a b c

echo c,b,a,b | IFS=, stream::array_unique  # => a,b,c