re='^[0-9]+$' if ! [[ $yournumber =~ $re ]] ; then echo "error: Not a number" >&2; exit 1 fi
Here is what the above code is Doing:
1. It’s checking if the input is a number.
2. If it’s not a number, it’s printing an error message and exiting the program.
3. If it is a number, it’s printing a message saying that it’s a number.
rustup self uninstall Here is what the above code is Doing: 1. Install rustup 2. Install the latest stable version of Rust 3. Install the latest nightly version of Rust 4. Install the latest beta version of Rust 5. Install the latest stable version of Rust 6. Uninstall rustup
sudo kill -9 $(lsof -i :3000 -t) Here is what the above code is Doing: 1. lsof -i :3000 -t returns the PID of the process running on port 3000 2. sudo kill -9 $(lsof -i :3000 -t) kills the process running on port 3000
$ sudo apt update $ sudo apt install wireshark $ sudo usermod -aG wireshark $(whoami) $ sudo reboot Here is what the above code is Doing: 1. Update the package list 2. Install Wireshark 3. Add your user to the wireshark group 4. Reboot your system
# To uninstall brew uninstall mysql@5.7 rm -rf /usr/local/var/mysql rm /usr/local/etc/my.cnf # To Reinstall brew install mysql@5.7 brew link –force mysql@5.7 brew services start mysql@5.7 Here is what the above code is Doing: 1. Uninstalling the current version of MySQL 2. Removing the MySQL data directory 3. Removing the MySQL configuration file 4. Reinstalling MySQL…
/etc/php/7.0/apache2 Here is what the above code is Doing: 1. We’re creating a new directory called /etc/php/7.0/apache2. 2. We’re copying the php.ini file from the /etc/php/7.0/apache2 directory to the /etc/php/7.0/apache2 directory. 3. We’re changing the owner of the /etc/php/7.0/apache2 directory to the www-data user and the www-data group. 4. We’re changing the permissions of the…
npm i -g vercel # or yarn global add vercel # or volta install vercel Here is what the above code is Doing: 1. Install the Vercel CLI globally. 2. Login to Vercel using your GitHub account. 3. Initialize a new project in the current directory. 4. Deploy the project. 5. Open the deployed project…