Linux

Common commands for the terminal.

Files

ls -lah: List with sizes & hidden
cp -r src dst: Copy recursively
mv a b: Move / rename
rm -rf dir: Delete recursively
find . -name "*.log": Find files

Text

grep -rin "todo" .: Recursive search
cat f | less: Page through output
sed -i "s/a/b/g" f: In-place replace
awk "{print $1}" f: Print a column
tail -f app.log: Follow a file

System

ps aux | grep node: Find a process
kill -9 PID: Force kill
df -h: Disk usage
chmod +x script.sh: Make executable
systemctl status nginx: Service status

Network

curl -fsSL url: Fetch a URL
ss -tulpn: Listening sockets
scp file host:/path: Copy over SSH
ssh user@host: Remote shell