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Shiva Shanmugam
Shiva Shanmugam

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Linux Essential Commands for DevOps Enthusiasts

#linux #cli #devops #basic

Mastering Linux commands is essential for DevOps professionals. Whether managing servers, automating tasks, or troubleshooting, these commands will streamline your workflow.

1ļøāƒ£ File & Directory Management

šŸ“‚ Navigating the Filesystem 

pwd                   # Show current directory
ls                    # List files & directories
cd <directory>        # Change directory
mkdir <directory>     # Create a new directory
rmdir <directory>     # Remove an empty directory
rm -rf <directory>    # Delete a directory and its contents
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šŸ“„ File Operations 

touch <file>          # Create an empty file
cat <file>            # View file content
less <file>           # View file content page by page
head -n <num> <file>  # Show first ā€˜nā€™ lines
tail -n <num> <file>  # Show last ā€˜nā€™ lines
mv <source> <dest>    # Move/rename a file
cp <source> <dest>    # Copy a file
rm <file>             # Delete a file
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2ļøāƒ£ User & Permission Management 

whoami                # Show current user
who                   # List logged-in users
id                    # Display user & group ID
chmod 755 <file>      # Change file permissions
chown user:group <file>  # Change file ownership
passwd                # Change password
adduser <username>    # Add a new user
deluser <username>    # Delete a user
sudo <command>        # Run command as superuser
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3ļøāƒ£ Process Management 

ps aux                # List running processes
top                   # Show system resource usage
htop                  # Interactive process viewer (if installed)
kill <PID>            # Terminate a process
killall <name>        # Kill all processes by name
pkill <pattern>       # Kill processes by pattern
nohup <command> &     # Run command in background
jobs                  # List background jobs
fg %<job_number>      # Resume background job
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4ļøāƒ£ Networking Commands 

ip addr show          # Show network interfaces
ping <host>           # Test network connectivity
netstat -tulnp        # Show open ports & connections
ss -tulnp             # Alternative to `netstat`
dig <domain>          # Fetch DNS info
wget <url>            # Download file from URL
curl -O <url>         # Fetch data from URL
scp <source> <user>@<host>:<dest>  # Secure copy between servers
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5ļøāƒ£ Disk & Storage Management 

df -h                 # Show disk usage
du -sh <dir>          # Show directory size
lsblk                 # List block devices
fdisk -l              # Show partitions
mount <device> <dir>  # Mount a filesystem
umount <device>       # Unmount a filesystem
fsck                  # Check & repair filesystem
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6ļøāƒ£ Logs & Monitoring 

tail -f /var/log/syslog  # Monitor system logs
journalctl -xe          # View system logs
dmesg                   # Kernel messages
uptime                  # Show system uptime
free -m                 # Check memory usage
vmstat                  # Show performance stats
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7ļøāƒ£ Package Management 

apt update            # Update package list
apt upgrade           # Upgrade installed packages
apt install <pkg>     # Install a package
apt remove <pkg>      # Remove a package
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8ļøāƒ£ Archiving & Compression 

tar -cvf archive.tar <dir>    # Create a tar archive
tar -xvf archive.tar          # Extract a tar archive
tar -czvf archive.tar.gz <dir>  # Create compressed tar archive
tar -xzvf archive.tar.gz      # Extract compressed tar archive
zip -r archive.zip <dir>      # Create a zip file
unzip archive.zip             # Extract a zip file
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9ļøāƒ£ Text Processing 

grep <pattern> <file>   # Search for text in a file
awk '{print $1}' <file>  # Process text with awk
sed 's/old/new/g' <file> # Replace text in a file
cut -d' ' -f1 <file>     # Extract columns from text
sort <file>              # Sort file contents
uniq <file>              # Remove duplicate lines
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šŸ”Ÿ Version Control with Git 

git clone <repo_url>   # Clone a repository
git init               # Initialize a new repo
git add <file>         # Stage changes
git commit -m "msg"    # Commit changes
git push origin <branch>  # Push to remote repo
git pull origin <branch>  # Pull latest changes
git status             # Show repo status
git log                # View commit history
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Conclusion

Mastering these Linux commands will make DevOps tasks easier, from automation to troubleshooting. Keep practicing, and take your Linux skills to the next level! šŸš€

Learn Let Learn !

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