End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

IO#isatty

ios.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 ios is associated with a terminal device (tty), false otherwise.

Example

File.new("testfile").isatty   #=> false
File.new("/dev/tty").isatty   #=> true

See also #ioflush #lineno #ioctl #lineno= also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0