CLI

Command Line Interpreter

This is simple project to simulate the operating system commands using Java

These are the commands that our program can execute them

• echo

  • Takes 1 argument and prints it.
  • Example: echo Hello, World!

• pwd

  • Takes no arguments and prints the current working directory.
  • Example: pwd

• cd

  • Takes 1 argument:
    • No argument: Changes the current path to the home directory.
    • "..": Changes the current directory to the previous directory.
    • Full or relative path: Changes the current path to the specified path.
  • Example: cd, cd .., cd /path/to/directory

• ls

  • Takes no arguments and lists the contents of the current directory sorted alphabetically.
  • Example: ls

• ls -r

  • Takes no arguments and lists the contents of the current directory in reverse order.
  • Example: ls -r

• mkdir

  • Takes 1 or more arguments and creates a directory for each argument.
  • Each argument can be a directory name or a path that ends with a directory name.
  • Examples: mkdir newDir, mkdir /path/to/newDir

• rmdir

  • Takes 1 argument:
    • "*" (e.g., rmdir *): Removes all empty directories in the current directory.
    • Full or relative path: Removes the given directory if it is empty.
  • Examples: rmdir *, rmdir /path/to/directory

• touch

  • Takes 1 argument, either the full path or the relative path that ends with a file name, and creates this file.
  • Example: touch newFile.txt

• cp

  • Takes 2 arguments, both are files, and copies the first onto the second.
  • Example: cp sourceFile.txt destinationFile.txt

• cp -r

  • Takes 2 arguments, both are directories (empty or not), and copies the first directory (with all its content) into the second one.
  • Example: cp -r sourceDirectory/ destinationDirectory/

• rm

  • Takes 1 argument which is a file name that exists in the current directory and removes this file.
  • Example: rm unwantedFile.txt

• cat

  • Takes 1 argument and prints the file’s content or takes 2 arguments and concatenates the content of the 2 files and prints it.
  • Example: cat file.txt, cat file1.txt file2.txt

• wc

  • Takes 1 argument and prints word count information.
  • Example: wc file.txt
  • Output: 9 79 483 file.txt (9 lines, 79 words, 483 characters with spaces)

• >

  • Redirects the output of the first command to be written to a file. If the file doesn’t exist, it will be created. If the file exists, its original content will be replaced.
  • Example: echo Hello, World! > output.txt

• >>

  • Like >, but appends to the file if it exists.
  • Example: echo Appending Text >> existingFile.txt

• history

  • Takes no parameters and displays an enumerated list with the commands you’ve used in the past.
  • Example: history
  • Output:

    1. ls
    2. mkdir tutorial
    3. history
    

• exit

  • Terminates the CLI.