End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

class method

Readline.completion_case_fold=

Readline.completion_case_fold = bool

ext/readline/readline.c View on GitHub ↗

static VALUE
readline_s_set_completion_case_fold(VALUE self, VALUE val)
{
    return rb_ivar_set(mReadline, completion_case_fold, val);
}

Sets whether or not to ignore case on completion.

See also .completion_case_fold .completion_proc .completion_append_character= .completion_proc= also in 3.2 · 3.1