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