extra_challenges.rst

Challenges

Fruit Pipes

1. Create a new directory fruit/
2. Create 7 empty text files like apple, banana etc.
3. Store all file names in a text file
4. List all file names that contain the letter a
5. Store the names with a in a text file
6. Use diff to find all file names not containing an a

The Locked Chest

1. Create a new directory secret_chamber/
2. Create an empty text file chest inside it
3. Use a pipe to store the word treasure inside the chest file
4. Lock the chest: remove read/write permission for everybody
5. Step out of the chamber to the parent directory
6. Hide the chamber by renaming it to .secret_chamber/
7. Read the contents of the chest

Hello World with Bash

Hello with a shell script

1. Write a bash script hello.sh that prints ‘Hello World’
2. Execute the program with source hello.sh

Hello with environment variables

1. Store the path+filename of hello.sh in the environment variable HELLO
2. Execute the program with source $HELLO

Hello repeat

1. Modify hello.sh to print a message given as an command-line argument (accessible via $1)
2. Test the script with source hello.sh 'Hello World
3. Write another bash script that launches hello.sh 10 times with different messages
4. Execute everything

Hello goodbye

1. Modify hello.sh to repeat the message every 10 seconds
2. Launch the script
3. Use bash commands to terminate the process
4. Launch the script 10 times
5. Use bash to terminate all 10 processes