C-Shell

Custom shell similar to bash implemented with the help of system calls in linux and used files for storing history of commands executed.

Commands (inbuilt)

Commands	Uses
cd	Used to change directory.
alias	Used to create a short alias for long commands and also able to view the currently set aliases.
unalias	Used to remove the alias for a command.
help	Used to get the information about the shell and set of inbuilt commands in it.
history	Used to view the history of commands executed.
clear	Used to clear the console.
exit	Exit out of the shell.

And all other commands other than inbuilt ones are executed using execve system call.

Compilation

Change directiory into src folder

    gcc -Wall -Werror -Wextra -pedantic -std=gnu89 *.c -o shell -w

This generates the binary named as shell.

Easy Access

• Create a folder in current user home directory

    mkdir -p /home/$USER/.bin

• Add the binary to this folder

    mv shell /home/$USER/.bin/

• Add the path of the folder to the environment variable to access easily.

    export PATH=$PATH:/home/$USER/.bin

The export does the change to env PATH variable only in the current session.

To make it permanent:

• Add this export command to your .bashrc file

    export PATH=$PATH:/home/$USER/.bin

Now you can easily access the binary from anywhere in the system logged in using the current user.

Features

Stores the history of commands executed.

Custom shell prompt

Built-in commands similar to bash.

In case if there is a mismatch between the precompiled version, download the source code and recompile it using your gcc compiler.