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

instance method

ARGF#binmode

ARGF.binmode → ARGF

static VALUE
argf_binmode_m(VALUE argf)
{
    ARGF.binmode = 1;
    next_argv();
    ARGF_FORWARD(0, 0);
    rb_io_ascii8bit_binmode(ARGF.current_file);
    return argf;
}

Puts ARGF into binary mode. Once a stream is in binary mode, it cannot be reset to non-binary mode. This option has the following effects:

Newline conversion is disabled.
Encoding conversion is disabled.
Content is treated as ASCII-8BIT.

See also #binmode? #argv #close also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0

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