$ command -v sudo
/usr/bin/sudo
$ command -v cd
cd
$ which sudo
/usr/bin/sudo
$ which cd
/usr/bin/cd
$ rpm -q --whatprovides /usr/bin/cd
bash-4.3.43-4.fc25.x86_64
$ (. /etc/os-release && echo $PRETTY_NAME)
Fedora 25 (Workstation Edition)
$ pwd
/home/alan
$ cd /home && pwd
/home
$ /usr/bin/cd /home/alan && pwd
/home
$ cd --help
bash: cd: --: invalid option
cd: usage: cd [-L|[-P [-e]] [-@]] [dir]