Advanced-Programming

Advanced Programming course assignment 1

Created By:

• Dana Zorohov
• Noa Nussbaum

MyShell is a shell program developed as part of our Advanced Programming course assignment. The program is designed to interpret and execute user commands in a simulated shell environment. It includes features commonly found in Unix-like shells,such as command execution, redirection, pipelining, handling variables, and control flow.

Getting Started

Prerequisites

• GCC compiler
• A Unix-like environment

Compilation

To compile the shell program, use the following command in your terminal:

make

Running the Shell

To start the shell, run:

./myshell

Features and Commands

The shell supports a variety of commands and features as described below:

1. Command Execution

   • Execute commands with arguments.

   hello: ls -l

2. Background Execution

   • Execute commands in the background using &.

   hello: ls -l &

3. Redirection

   • Redirect output to a file using >.

   hello: ls -l > file

   • Append output to a file using >>.

   hello: ls -l >> mylog

   • Redirect standard error using 2>.

   hello: ls -l nofile 2> mylog

4. Pipelines

   • Use pipes to direct the output of one command as the input to another.

   hello: cat myfile | grep "search_term"

5. Variable Handling

   • Set and use variables.

   hello: $person = David
   hello: echo $person

6. Read Command

   • Prompt for input and store in a variable.

   hello: read name
   hello: echo $name

7. Command History

   • Navigate through recent commands using the up and down arrow keys.

8. Control Flow

   • Implement if-else conditions.

   if date | grep Fri
   then
     echo "Shabat Shalom"
   else
     echo "Hard way to go"
   fi

9. Change Prompt

   • Change the command prompt display.

   hello: prompt = myprompt

10. Change Directory

    • Change the current working directory.

    hello: cd mydir

11. Repeat Last Command

    • Repeat the last executed command using !!.

    hello: !!

12. Exit

    • Exit the shell using quit.

    hello: quit

13. Interrupt Handling

    • Handle Ctrl-C interrupts gracefully, printing a message rather than terminating.