RHEL Package Management & Operations
The dnf command you run to install a new software package from your local repository mirror.
dnf install
The shortcut key combination on Windows used to open Task Manager directly.
Ctrl + Shift + Esc
The command used to check available disk space and filesystem usage in a human-readable format.
df -h
The basic PowerShell command used to list all files and folders in your current directory (similar to dir or ls).
Get-ChildItem or ls / dir
The most famous, universal troubleshooting fix in all of IT that magically solves about 50% of computer problems.
Turning it off and on again / A reboot
To check if a local server has any pending software updates available from the internal repository, you run this command.
dnf check-update or dnf update
The classic Windows command-line utility used to check a machine's current IP address and subnet mask.
ipconfig
The command used to view the active IP addresses and network interfaces assigned to a RHEL server.
ip a or ip addr
The Windows command-line tool used to test basic network connectivity to another host by sending ICMP echo requests.
ping
Celebrated on the last Friday of July, this is the official holiday where we honor the people who reset our passwords and fix our machines.
System Administrator Appreciation Day
The command used to view the real-time, scrolling log output of a system service using systemd.
journalctl -f
The default port number used for Remote Desktop Protocol (RDP) connections in Windows.
3389
The file where Linux stores local user account information and metadata.
/etc/passwd
The PowerShell cmdlet used to clear the text screen, similar to clear in Linux or cls in cmd.
Clear-Host or cls
According to classic IT folklore, the absolute worst day of the week to deploy a major configuration change to production.
Friday
This command displays the current date, time, and timezone settings on a Linux system.
timedatectl
The built-in Windows graphical tool used to manage disk volumes, partition drives, and initialize new storage hard disks.
Disk Management / diskmgmt.msc
The standard file permission numeric value (chmod) that gives the owner full read/write/execute access, but only read-and-execute access to group and others.
755
The command-line utility used to query local DNS records and troubleshoot name resolution issues on an internal domain.
nslookup
The famous blue diagnostic error screen on Windows that strikes fear into the heart of any tech worker.
The Blue Screen of Death / BSOD
The directory where administrators traditionally place custom scripts or locally compiled binaries for execution across the system.
/usr/local/bin
The command-line tool used in Windows to shut down or restart a local or remote computer.
shutdown
The command used to switch your current user session to the root superuser account.
su or sudo -i
The Windows command-line tool used to display the active TCP/IP network connections and listening ports on a local machine.
netstat
The exact phrase a user says right before you discover they manually deleted critical system files because their desktop icon looked weird.
"I didn't touch anything!"