Useful Linux Commands

Filesystem

• du -h --max-depth 1 {DIR}: Disk usage in directory
  • -h makes the sizes human readable
• chmod +x {FILE}: Makes file executable
• ls -hla: List all files in a directory
  • -h makes the sizes human readable
  • -l displays more info, such as file sizes and permissions
  • -a lists all files, including hidden ones

Git

• git branch -m {NEW_NAME}: Rename the current git branch
• git remote set-url origin {NEW_URL}: Set a new remote as origin

Networking

• curl -O {URL}: Download a file
• firewall-cmd --{add|remove}-port {PORT}/{PROTOCOL}: Open a port in the firewall
• netstat -tuln: Shows listening ports
  • -t shows TCP ports
  • -u shows UDP ports
  • -l shows only listening ports, not all connected
  • -n means don’t resolve addresses