# Navigation
pwd                     # Current directory
ls                      # List files
ls -la                  # List detailed including hidden
cd directory            # Change directory
cd ..                   # Go up one level
cd ~                    # Go to home

# File Management
touch file.txt          # Create empty file
mkdir directory         # Create directory
cp source dest          # Copy
mv source dest          # Move/rename
rm file                 # Remove file
rm -rf directory        # Remove directory

# Viewing Content
cat file                # Display file content
head -n N file          # Show first N lines
tail -n N file          # Show last N lines
grep pattern file       # Search in file
wc file                # Line/word/char count

# Editing
nano file              # Text editor
vi/vim file            # Advanced editor

# Changing Permissions
chmod 755 file         # Set permissions
chmod u+x file         # Add execute permission
chown user:group file  # Change ownership

# ACL
getfacl file          # Get ACL permissions
setfacl -m u:user:rw  # Set ACL permissions

# Process Management
ps aux                # List processes
top                   # System monitor
kill PID              # Kill process

# Package Management
apt update            # Update package list
apt install pkg       # Install package
systemctl status svc  # Check service status

# Repository Setup
git init              # Initialize repository
git clone URL         # Clone repository
git remote add origin URL  # Add remote

# Daily Commands
git status            # Check status
git add file          # Stage changes
git commit -m "msg"   # Commit changes
git push origin branch # Push changes
git pull              # Update local repo

# Branch Management
git branch            # List branches
git branch name       # Create branch
git checkout branch   # Switch branch
git checkout -b name  # Create & switch
git merge branch      # Merge branch

# Advanced Operations
git rebase main       # Rebase to main
git cherry-pick commit # Pick specific commit
git stash             # Stash changes

# History
git log               # View history
git log --oneline     # Compact history
git blame file        # Show who changed what

# Undoing Changes
git reset HEAD~1      # Undo last commit
git revert commit     # Revert commit
git checkout -- file  # Discard changes