Cshell

An Interactive user defined bash-like shell

About the shell

Cshell is an interactive user defined bash-like shell that supports semi-colon separated list of commands.

📁 File-Structure

.
├── LICENSE
├── Makefile
├── README.md
└── src

1 directory, 3 files

• src - This directory contains all the .c files for the various commands. More information about each file is present in the directory.

🏃 How to execute the shell

• Compile the .c files using the following command.

make Cshell

• Run the shell using the following command.

./Cshell

• To exit the shell, use the following command.

quit

• On executing the shell, A command line is generated of the format: username@systemname:~.

List of commands along with flags.

Command	Description	Flags	Usage	Number of Arguments
ls	Lists the files and directories present.	[la]	ls -[la] [path]	0 or 1 (path to the directory)
pwd	Prints the path of the current directory	-	pwd	-
cd	Change Directory	-	cd [path]	1 (path to the directory)
echo	Print on terminal	-	echo [message]	0 or more (message to be printed)
pinfo	Display the process info of the given process id	-	pinfo [process id]	0 or more (process id)
clock	Displays dynamic date and time	[t][a]	clock -t [2] -n [3]	2 (displays time after [t] seconds [n] times)
remindme	Set a reminder for the time given	-	remindme [time] [message]	1 or 2 (displays [message after [time] seconds])
setenv	Can be used to create/change environment variables	-	setenv [var_name] [value]	1 or 2 (sets the environment variable [var_name] to [value])
unsetenv	Can be used to remove environment variables	-	unsetenv [var_name]	1 (unsets the environment variable [var_name])
jobs	Lists the background processes with status	-	jobs	-
kjob	Kill the process listed in jobs	-	kjob -[9] [job_id]	2 (signal to send and [job_id])
overkill	Kill all background processes	-	overkill	-
fg	Bring a background process to foreground	-	fg [job_id]	1 ([job_id] of the background process)
bg	Used to restart a stopped background process	-	bg [job_id]	1 ([job_id] of the background process)
quit	Used to exit the shell	-	quit	-

Features

• Supports semi-colon separated commands.
• Background processes can be created by appending & to the command.
• Supports input and output file redirection.
• Supports piping of commands.
• Supports signals like Ctrl+Z , Ctrl+C.

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Feel free to contribute. ❤️