End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
class method
Process::Sys.setegid
Process::Sys.setegid(group) → nil
process.c
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static VALUE
p_sys_setegid(VALUE obj, VALUE id)
{
check_gid_switch();
if (setegid(OBJ2GID(id)) != 0) rb_sys_fail(0);
return Qnil;
}
Set the effective group ID of the calling process to group. Not available on all platforms.