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Introduction

Linux is a powerful open-source operating system used by developers worldwide. Mastering essential commands is the first step to becoming proficient in Linux. Whether you are a system administrator, developer, or DevOps engineer, these commands are indispensable for daily work.

Navigation Commands

Navigating the file system is the most basic Linux skill you need to learn.

# Print current directory
pwd

# List files and directories
ls -la

# Change directory
cd /home/user
cd ..       # Go up one level
cd ~        # Go to home directory

File Operations

# Create a file
touch myfile.txt

# Copy a file
cp source.txt destination.txt

# Move or rename a file
mv oldname.txt newname.txt

# Remove a file
rm myfile.txt

# Create a directory
mkdir -p mydir/subdir

Viewing File Contents

# Display entire file
cat file.txt

# View file with paging
less file.txt

# Show first 10 lines
head file.txt

# Show last 10 lines
tail -f /var/log/syslog

Search and Find

# Search for text in files
grep -r "hello" /path/to/dir

# Find files by name
find / -name "*.log" -type f

# Find files modified in last 24 hours
find . -mtime -1

Summary

These essential Linux commands form the foundation for system navigation, file management, and text processing. Practice them daily to build muscle memory and speed up your workflow.