This is an evolving collection of bash snippets I have found useful over the years. Note that some may work only on macOS and/or Linux.
Process Management
# Process info
ps aux | grep node
pgrep -f "node server"
pkill -f "node server"
jobs # Background jobs
nohup command & # Run in background
# System monitoring
top -o cpu
htop # If installed
lsof -i :3000 # What's using port 3000
netstat -tulpn # Open ports Files
# Find files
find . -name "*.js" -type f
find . -name "node_modules" -type d -exec rm -rf {} +
# File info
ls -la # Detailed list
du -sh * # Directory sizes
df -h # Disk usage
stat filename # File metadata
# Copy/move with progress
rsync -av --progress src/ dest/ Text Processing
# Search in files
grep -r "TODO" .
grep -r "console.log" --include="*.js" .
# Text manipulation
cat file.txt | head -20 # First 20 lines
cat file.txt | tail -20 # Last 20 lines
cut -d',' -f1,3 file.csv # Extract CSV columns
sort file.txt | uniq # Remove duplicates
wc -l file.txt # Line count
# Replace text
sed 's/old/new/g' file.txt
sed -i '' 's/old/new/g' file.txt # In-place (macOS) Networking
Make a simple network request with JSON:
curl -X POST \
-H "Content-Type: application/json" \
-d '{"name": "John", "email": "john@example.com"}' \
https://api.example.com/users If you want to quickly kill the process running at a specific port (8080 )
lsof -ti :8080 | xargs kill -9 Git
# restore a file from a remote branch (e.g. master)
git checkout origin/master -- ./src/dir/file-to-restore.txt
# rollback a commit
git reset --hard HEAD~1
# rollback a commit and keep changes
git reset --soft HEAD~1
# rollback a commit and keep changes (e.g. if you forgot to add a file)
git reset --soft HEAD~1
git add .
git commit -m "Add forgotten file"
git push FFMPEG
Convert a .wmv to .mp4 with FFMPEG:
ffmpeg -i input.wmv output.mp4 Download a streamed video (.m3u8 ) to output.mp4
ffmpeg -protocol_whitelist file,http,https,tcp,tls,crypto -i "https://example.com/video720p.h264.mp4.m3u8" -c copy output.mp4 Archives & Downloads
# Compress/extract
tar -czf archive.tar.gz folder/
tar -xzf archive.tar.gz
unzip file.zip
zip -r archive.zip folder/
# Download
wget https://example.com/file
curl -O https://example.com/file Alias
alias ll='ls -la'
alias la='ls -A'
alias ..='cd ..'
alias ...='cd ../..'
alias grep='grep --color=auto'
alias ports='lsof -i -P | grep LISTEN'
alias myip='curl -s ipinfo.io/ip' System Info
uname -a # System info
whoami # Current user
uptime # System uptime
free -h # Memory usage (Linux)
which node # Find command location
type node # Command type info