Method: IO#tty?

Defined in:
io.c

#isatty ⇒ Boolean

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

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

Returns:

  • (Boolean) 


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# File 'io.c', line 5293

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

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