Small Shell

My implementation of linux shell in C, refer to the guide for detailed description of functions and usage.

• Handles variable assignment and expansion
• Piping of commands ( | )
• Only Output redirection ( > and >> ) is supported for now.
• Catches SIGINT and prevents interruption.
• Inbuild commands are
  • cd Change Current Directory
  • showvar Print shell variables
  • showenv Print environment varaibles
  • export Export variable to environment scope
  • unset Remove varaible from environment scope
  • pushd Add directory node to top od directory stack
  • popd Remove directory node from stack
  • dirs Print directory stack
  • source Execute commands from script file
  • exit Exit the shell

To compile you need the readline package , run the following command in terminal to install the package, ignore if already installed.

sudo apt-get install libreadline8 libreadline-dev

The readline library provides line auto-completion and suggestion with history functionality.

To compile using gcc and execute run the following command.

make all; ./shell 

Exit the shell by typing exit or quit .