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Osagie Anolu
Osagie Anolu

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Keep calm and learn Linux

#devops #linux #cloud

Comprehensive Guide to Essential Linux Commands

Essential Linux Commands: A Practical Guide

Linux's power lies in its command-line interface (CLI), making it a favorite among developers and system administrators. This guide covers the fundamental commands you'll need for effective system management.

Basic Navigation 

pwd     # Print working directory
cd      # Change directory
cd ..   # Move up one level
cd ~    # Go to home directory
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File and Directory Operations

Listing and Creating 

ls      # List files and directories
ls -lah # Detailed list (long format, all files, human-readable sizes)
touch   # Create empty file
mkdir   # Create directory
mkdir -p # Create nested directories
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Manipulating Files 

cp file1 file2     # Copy files
cp -r dir1 dir2    # Copy directories recursively
mv old new         # Move or rename
rm file           # Delete file
rm -r dir         # Delete directory recursively
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File Permissions 

chmod 755 file    # Set permissions (rwxr-xr-x)
chmod u+x file    # Add execute permission for user
chown user:group file  # Change ownership
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Text File Operations

Viewing Content 

cat file          # Display entire file
less file         # Page through file
head -n 10 file   # Show first 10 lines
tail -n 10 file   # Show last 10 lines
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Text Editing

  • nano: Beginner-friendly editor
  • vim: Advanced editor with powerful features
  • grep "term" file: Search within files
  • grep -i "term" file: Case-insensitive search

Process Management 

ps aux           # List all processes
top             # Real-time process monitor
kill PID        # Terminate process by ID
killall name    # Terminate process by name
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Network Operations 

ip addr         # Show network interfaces
ping host       # Test connectivity
netstat -tuln   # Show network connections
ss             # Modern alternative to netstat
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System Information 

df -h           # Disk space usage
du -h           # Directory space usage
uname -a        # System information
uptime         # System uptime and load
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Pro Tips

  1. Use Tab completion to avoid typing full paths
  2. Access command history with up/down arrows
  3. Chain commands with && (AND) or || (OR)
  4. Use man command for detailed documentation
  5. Combine commands with pipes (|) for powerful operations

Remember: Linux commands are case-sensitive, and most can be modified with flags (options) that start with - or --. When in doubt, use --help or man to learn more about any command.

Top comments (1)

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Joseph Ibeh •

Nice. Weldon brother