Custom shell similar to bash implemented with the help of system calls in linux and used files for storing history of commands executed.
| 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.
Change directiory into src folder
gcc -Wall -Werror -Wextra -pedantic -std=gnu89 *.c -o shell -w
This generates the binary named as shell.
- 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.
Stores the history of commands executed.
Custom shell prompt
Built-in commands similar to bash.