GREP — Find Text in Files
grep "pattern" file.txt
Search for "pattern" in file.txt
grep -i "pattern" file.txt
Case-insensitive search
grep -v "pattern" file.txt
Show lines that don't match
grep -r "pattern" folder/
Recursive search in folder
Common Bash Commands
ls
List files and folders
cd folder/
Change directory
pwd
Show current directory
mkdir new_folder
Make a new folder
rm file.txt
Delete a file
cat file.txt
Print file contents
Claude Code + WSL
wsl
Start WSL Linux environment
code .
Open current folder in VS Code
git clone <url>
Clone a GitHub repo
npm start
Start a Node.js app
Extended Bash Commands
chmod +x file.sh
Make script executable
ps aux
List all processes
df -h
Show disk space
tar -czvf archive.tar.gz folder/
Create compressed archive
curl http://url.com
Fetch content from URL
top
Live process monitor
Useful Bash Patterns
# Pipe output to grep ls -l | grep ".txt" # Count lines with a match grep -c "error" logfile.txt # Save command output to a file ls > list.txt # Append output to a file echo "New entry" >> notes.txt
PATH & Environment Variables
echo $PATH
Show your current PATH
export PATH=$PATH:/new/path
Add directory to PATH
export VAR_NAME="value"
Create environment variable
echo $VAR_NAME
Access variable value
💡 Tip: Add environment variables to ~/.bashrc or ~/.bash_profile to make them permanent.