A shell in C language which supports most functionalities of a Unix shell like I/O redirection, piping, job control etc.
headers.hcontains function declaration for all functions.- The other files have the code for implementing the tasks suggested by the name of the files.
- The code starts executing from main.c from where all other functionalities are performed.
- The history will be displayed for maximum 20 latest commands.
- At max 100 commands will be given in one line.
- Each command is less than 100 characters.
- All paths involved are less than 1000 characters.
- Builtin commands - {cd,pwd,echo}.
- ls command - implemented various flags including -a - l.
- System commands with and without arguments.
- Foreground: process waits until the commands get executed.
- Background: process doesn't wait for system commands get executed.
- Upon completion of background, a completion message is prompted.
- Repeat command to repeat a command multiple times.
- pinfo command to display process information.
- jobs: it displays information of the currently running background processes
- sig: it kills a background process
- fg: it brings a background process to foreground and runs it
- bg: it stops a running background process.
- The makefile will compile the code.
- Enter
makecommand to compile the code. - The shell can be executed by running the
./a.outexecutable. - ./a.out to run the program.
- Enter
quitto exit the shell.
- Redirection and piping functionality has been added in the input.c file
- In this file, the redirections of inputs and outputs have been handled.
- Piping of commands is also implemented in the same file.
- ctrl + c : terminates any running foreground process
- ctrl + z : sends a foreground process to background and changes its state from running to stopped.
- ctrl + d : terminates the shell.