Method: IO#isatty

Defined in:
io.c

#isatty ⇒ Boolean #tty? ⇒ Boolean

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

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

Overloads:

  • #isatty ⇒ Boolean

    Returns:

    • (Boolean)
  • #tty? ⇒ Boolean

    Returns:

    • (Boolean)
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# File 'io.c', line 4481

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

    GetOpenFile(io, fptr);
    if (isatty(fptr->fd) == 0)
	return Qfalse;
    return Qtrue;
}