This directory contains a series of scripts that demonstrate shell redirections and filters. These scripts are designed to help users understand and practice fundamental shell operations related to input/output redirection, piping, and text processing using various shell utilities.
- Understand the basic concepts of input/output redirection
- Learn how to use pipes to connect multiple commands
- Understand how to use common text processing commands such as
cat,grep,cut,sort,uniq,awk, andsed - Learn how to create and execute shell scripts that utilize redirections and filters
| Task | Description | File |
|---|---|---|
| 0. Hello World | Write a script that prints "Hello, World" | 0-hello_world |
| 1. Confused smiley | Write a script that displays a confused smiley "(Ôo)' |
1-confused_smiley |
| 2. Let's display a file | Display the content of the /etc/passwd file |
2-hellofile |
| 3. What about 2? | Display the content of /etc/passwd and /etc/hosts |
3-twofiles |
| 4. Last lines of a file | Display the last 10 lines of /etc/passwd |
4-lastlines |
| 5. I'd prefer the first ones actually | Display the first 10 lines of /etc/passwd |
5-firstlines |
| 6. Line #2 | Display the third line of the file iacta |
6-third_line |
| 7. It is a good file that cuts iron without making a noise | Write a shell script that creates a file named exactly \*\\'"Best School"\'\\*$\?\*\*\*\*\*:) containing the text Best School |
7-file |
| 8. Save current state of directory | Write a script that writes into the file ls_cwd_content the result of the command ls -la |
8-cwd_state |
| 9. Duplicate last line | Write a script that duplicates the last line of the file iacta |
9-duplicate_last_line |
| 10. No more javascript | Write a script that deletes all the regular files with a .js extension in the current directory and all its subfolders |
10-no_more_js |
| 11. Don't just count your directories, make your directories count | Write a script that counts the number of directories and sub-directories in the current directory | 11-directories |
| 12. What’s new | Create a script that displays the 10 newest files in the current directory | 12-newest_files |
| 13. Being unique is better than being perfect | Create a script that takes a list of words as input and prints only words that appear exactly once | 13-unique |
| 14. It must be in that file | Display lines containing the pattern "root" from the file /etc/passwd |
14-findthatword |
| 15. Count that word | Display the number of lines that contain the pattern "bin" in the file /etc/passwd |
15-countthatword |
| 16. What's next? | Display lines containing the pattern "root" and 3 lines after them in the file /etc/passwd |
16-whatsnext |
| 17. I hate bins | Display all the lines in the file /etc/passwd that do not contain the pattern "bin" |
17-hidethisword |
| 18. Letters only please | Display all lines of the file /etc/ssh/sshd_config starting with a letter |
18-letteronly |
| 19. A to Z | Replace all characters A and c from input to Z and e respectively |
19-AZ |
| 20. Without C, you would live in hiago | Create a script that removes all letters c and C from input |
20-hiago |
| 21. esreveR | Write a script that reverse its input | 21-reverse |
| 22. DJ Cut Killer | Write a script that displays all users and their home directories, sorted by users | 22-users_and_homes |
| 23. Empty casks make the most noise | Write a command that finds all empty files and directories in the current directory and all sub-directories | 100-empty_casks |
| 24. A gif is worth ten thousand words | Write a script that lists all the files with a .gif extension in the current directory and all its sub-directories |
101-gifs |
| 25. Acrostic | Create a script that decodes acrostics that use the first letter of each line | 102-acrostic |
| 26. The biggest fan | Write a script that parses web server logs in TSV format as input and displays the 11 hosts or IP addresses which did the most requests | 103-the_biggest_fan |
- Ensure you have the necessary permissions to execute the scripts.
- Test the scripts in a safe environment to avoid any unintended changes to your system.
- Refer to the resources provided for a deeper understanding of each command and its options.