CoreUtils is a project that mimics some linux commands.

1. head

• Print the first 10 lines of input by default.
• Add a -n flag to specify the number of lines to print.
• Default 10 lines.

user@user-VirtualBox:~$ python3 head.py -n 4 fileName

2. tail

• Print the last 10 lines of input by default.
• Add a -n flag to specify the number of lines to print.
• Default 10 lines.

user@user-VirtualBox:~$ python3 tail.py -n 4 fileName

3. wc (word count)

• Count lines, words, and characters in the input.
• Add -l, -w, and -c flags to display only lines, words, or characters respectively.
• Default displays lines, words, and characters.

user@user-VirtualBox:~$ python3 wc.py -w -c  fileName

4. cat

• Concatenate and print files.
• Add a -n flag to number output lines.

user@user-VirtualBox:~$ python3 cat.py -n fileName1 fileName2 fileName3

5. echo

• Print arguments to standard output.
• Add a -n flag to omit the trailing newline.

user@user-VirtualBox:~$ python3 echo.py -n hello world

6. env

• Print enviroment variables to standard output.

user@user-VirtualBox:~$ python3 env.py

7. tree

• Print tree structure of a directroy to standard output.
• Add a -L flag to stop at a certain level.

user@user-VirtualBox:~$ python3 tree.py -L 5 DirectoryName

8. yes

• Repeatedly output a message to standard output.
• Default message "y".

user@user-VirtualBox:~$ python3 yes.py hello world

9. true

• Returns a successful exit status code of 0.

user@user-VirtualBox:~$ python3 true.py 

10. false

• Returns an unsuccessful exit status code of 1.

user@user-VirtualBox:~$ python3 false.py