On April 28, 2022 4:56 PM, Carlo Arenas wrote:
>On Thu, Apr 28, 2022 at 1:43 PM <rsbecker@xxxxxxxxxxxxx> wrote:
>> I tried to find is_root in POSIX but could not. Do you have a reference? It is not in
>bash 4.3.48, which is on our older system.
>
>my bad; is_root is a helper function i provided as part of this file; the latest version
>which should work in your posix system AND was specifically written to hopefully
>not break with NON-STOP based on what you told us about it looks like (hand
>edited and not tested) :
>
>is_root() {
> id -u >u
> id -u root >r
> cmp u r
>}
This is about as portable as I can find and works even in ksh. It could be optimized.
is_root() {
id -u >u
id -u root >r
cmp -s u r
if [ $? -ne 0 ]; then
echo 0
else
echo 1
fi
}
if [ `is_root` -ne 0 ]; then
echo root
else
echo Not root
fi
