DESCRIPTION
The
check_utility_compat()
function checks whether
utility
should behave in a traditional
(Fx 4.7-compatible)
manner, or in accordance with
IEEE Std 1003.1-2001 ("POSIX.1").
The configuration is given as a comma-separated list of utility names;
if the list is present but empty, all supported utilities assume their
most compatible mode.
The
check_utility_compat()
function first checks for an environment variable named
_COMPAT_FreeBSD_4.
If that environment variable does not exist, then
check_utility_compat()
will attempt to read the contents of a symbolic link named
/etc/compat-FreeBSD-4-util.
If no configuration is found, compatibility mode is disabled.