Basic Linux Shell

Overview

A basic linux shell designed and developed using standard C libraries and linux system calls such as fork(), execl(), pthread_create(), system()

Implemented 3 internal commands in addition to 5 external commands along with some command line options for each. Some corner cases have also been handled for each of them.

Tech Stack

     

Instructions

Run the following commands on the terminal

# clone this repository
git clone https://github.com/mohitg66/Basic-Linux-Shell.git
cd Basic-Linux-Shell

# compile the source
make

Commands

• For Process based execution: Simply run the commands, for example

ls -a

• For Thread based execution: Add &t before the command, for example

&t ls -a

Internal Commands

cd

cd
cd -L
cd ..

echo

echo
echo -E
echo -n

pwd

pwd
pwd -L
pwd -P

External Commands

ls

ls
ls -a
ls -p

cat

cat
cat -n
cat -e

date

date
date -R
date -I
date -a

rm

rm
rm -i
rm -f
rm -n

mkdir

mkdir
mkdir -v
mkdir -p

Assumptions

• command line options other than the ones mentioned are invalid
• echo no use of $
• ls works only for the current working directory, no path to be given
• cat can’t read multiple files at once
• date the shell uses the system’s date which may not be correctly synced
• rm cannot delete multiple files at once

Author

Mohit Gupta

• GitHub: mohitg66
• Email: mohit21339@iiitd.ac.in