C- Shell

Assignment 3 By 20171019

Usage

• make
• ./shell

Features

• shell prompt
• cd , echo, pwd commands
• ls command with flags -l -a -la -al
• background and foreground process
• pinfo command
• history n command
• input output redirection
• piping
• piping with redirection
• jobs handling (fg,bg,overkill,kjobs etc)
• ctrl z and ctrl c signal handling
• setenv and unsetenv

Files

background.c

• function to maintain an array of newly added background process

commands.c

• implementation of cd, pwd and echo command

environment.c

• implementation of setenv and unsetenv

history.c

• implementation of history and history n command

job.c

• implementation of jobs, kjobs, bg , fg and overkill commands

ls.c

• implementation of the ls command with its various flags

main.c

• main shell file that in a while loop calls the prompt, gets input from user and checks for finished background process

parse.c

• parses the input based on tokenization, piping and redirection (;) and calls functions for the respective commands accordingly after parsing

pinfo.c

• implementation of the pinfo and pinfo pid command