The free command tells how much swap space is on a Linux system, but it doesn’t tell where it is. When this question pops up in my mind, I check the /etc/fstab file and the result is mostly accurate except on one server that I’ve just reinstalled.
Do you have a program similar to Windows Device Manager or msinfo32 for sysadmin to gather hardware information without opening the computer chassis?
Automate wget to login FTP server and download folders recursively.
Using Linux cron configuration shorthand to automate job at a fixed interval.
Install and configure pptpd VPN server on Redhat Enterprise Linux or CentOS 5.
The Vi command to do interactive search and replace.
There are at least two ways to configure Linux VNC server to access GNOME Desktop on RHEL / CentOS.