${(L)…}: Convert to lowercase

(L) converts all letters of the result to lowercase.

(U) is the opposite and converts to uppercase.

Links

• Zsh manual on parameter expansion flags

Examples

Convert array values to lowercase

1 2	declare data=(JOE WILLIAM JACK AVERELL) echo "Dalton brothers: ${(L)data}"

Output:

1	Dalton brothers: joe william jack averell