I can not get access to /proc/sys/kernel/hostname file

Question

After following the Anon Uimik's instructions to get root access here:

How to make Termux obtain root access?

I'm trying to get the value of the file /proc/sys/kernel/hostname but I'm getting Permission denied. Any help?

~ # cat /proc/sys/kernel/hostname
cat: /proc/sys/kernel/hostname: Permission denied