https://github.com/kaustubhhiware/cshell

A basic shell. Written in C
https://github.com/kaustubhhiware/cshell

c cat cshell linux shell

Last synced: about 1 year ago
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A basic shell. Written in C

• Host: GitHub
• URL: https://github.com/kaustubhhiware/cshell
• Owner: kaustubhhiware
• License: mit
• Created: 2017-01-25T18:49:33.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2018-02-01T10:15:39.000Z (over 8 years ago)
• Last Synced: 2025-03-30T11:11:50.178Z (about 1 year ago)
• Topics: c, cat, cshell, linux, shell
• Language: C
• Size: 268 KB
• Stars: 24
• Watchers: 1
• Forks: 15
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# Cshell

A shell implemented in C. Written as a part of Operating Systems (CS39002) coursework.

![Cshell_about](images/Cshell_about.png)

## Functionalities

 The following functions have been written explicitly in C.

* **cd**  - Change directory

* **pwd** - Present Working directory

* **mkdir ** - Make a directory (Alerts if already exists)

* **rmdir ** - Remove the directory (Alerts if no such file or directory)

* **ls** - List contents of pwd

 ![images/ls](images/ls.png)

* **ls -l** - List the contents in long listing format

 ![images/ls_l](images/ls_l.png)

* **cp  ** - Copy contents of file1 to file2; only if file1 was more recently modified. Create file2 if not present already.

* **exit** - Exit the shell ; also works for **z**

* Supports running the **execuables** (predominanatly, ./a.out and scripting commands, like touch, cat, python notif.py )

 * Any path added to your `$PATH` folder will work. [Refer to function runprocess in shell.c]

 * Support background execution such as `python notif.py &`  - returns its PID.

 * Input from and output to files, such as `./d < in.txt` and `./inc > in.txt` supported. (Both can work simultaneously.)

 * Support piping upto 2 levels - such as `./inc | ./d` and `./inc | ./d | ./t `

## Execution

make clean

make

./Cshell


Output :

![images/exec](images/exec.png)

The test cases are present in [tests](tests/) folder.

`run.c` creates a child process to execute `shell.c` in a gnome-terminal, suited for debuggging. In case the terminal session is to be viewed in the continuing session, execution is as :

make clean

make

./myshell


## Known issues

* `gcc` and `grep` don't work for some freaking reason. Most of the other commands like cat, touc, gedit, atom work but these 2 seem to hold a grudge against me.

* support piping with system calls.