* chage (manage user password settings)
* hostnamectl (show hostname settings)
* date (manage system date and time)
* rpm (means RedHat Package Manager)
* timedatectl (show timezone settings)
* tcpdump (analyze network packages)
* tar (compress the files for archiving)
* tree (see the files as tree format)
* wc (means word count)
* yum (manage RPM packages on RedHat distro)
