How I may check root environment variables from sudo user? I tried various keys and combinations of su and sudo, but have no luck.
For example, $HISTFILESIZE=2000 for ordinary user and 9999 for root user.
vagrant@default-debian-78-64-nocm:~$ echo $HISTFILESIZE
2000
vagrant@default-debian-78-64-nocm:~$ sudo -i
root@default-debian-78-64-nocm:~# echo $HISTFILESIZE
9999
But when I try to get root $HISTFILESIZE via sudo - it always returns me a 2000:
vagrant@default-debian-78-64-nocm:~$ sudo -i echo $HISTFILESIZE
2000
vagrant@default-debian-78-64-nocm:~$ sudo -i su - -c "echo $HISTFILESIZE"
2000
vagrant@default-debian-78-64-nocm:~$ sudo -i bash -c "echo $HISTFILESIZE"
2000
vagrant@default-debian-78-64-nocm:~$ sudo -i bash -l -c "echo $HISTFILESIZE"
2000