End of Life Ruby 3.2 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

IO#isatty

isatty → true or false

static VALUE
rb_io_isatty(VALUE io)
{
    rb_io_t *fptr;

    GetOpenFile(io, fptr);
    return RBOOL(isatty(fptr->fd) != 0);
}

Returns true if the stream is associated with a terminal device (tty), false otherwise:

Example

f = File.new('t.txt').isatty    #=> false
f.close
f = File.new('/dev/tty').isatty #=> true
f.close

See also #ioflush #lineno #ioctl #lineno= also in 4.1 · 4.0 · 3.4 · 3.3 · 3.1 · 3.0