Simple Shell
Simple_Shell is our mini replicat of the processes of the 'bash' or 'sh' by executing commands and interacting with the kernel.
Current features
- $PATH : Where the commands Runs
- local and Environment variables
-
$? return values, $ $ pid - $# number of arguments and $0-9
- &&/|| as logical operators with multi-line continuation
- using ; as is the command separator
- using ~ expansion to current user's home directory
- unclosed multi-line quote continuation
- : as escaping
- it Runs commands from the input as well as script files.
Built-ins:
- help
- exit
- setenv
- unsetenv
- env (listing environment functionality only)
- cd
- alias
- unalias
- history
Getting started
you must first compile this shell into a $PATH folder like /usr/local/bin to be able to use it, And to do so you have to clone the project, navigate to the directory, and then type:
gcc -o simple_shell *.c
Then you have to copy the output file to /usr/local/bin you can always add sudo if it doesn't work
cp simple_shell /usr/local/bin
Now you'll be able to use the shell.
Usage Examples
start by opening the shell and running a simple command like pwd, then exit:
Username@your-regular-prompt:~$ simple_shell
simple_shell:/home/username$ pwd
/home/username/
simplesh:/home/username$ exit
Username@your-regular-prompt:~$
the command pwd lists the current working directory. We're able to also run script files.
#!/usr/bin/env simple_shell
echo Hello from simple shell!
the output of the executed script will display "Hello from simple shell!" in our terminal. We can use cmd line afruments for variables like in the following example :
#!/usr/bin/env simple_shell echo Hello $2
let's try passing an argument we can do it like so :
Username@your-regular-prompt:~$ ./helloscript "simple shell!" Hello simple shell!
## Usage Examples
Interactive Mode
$ cat test_ls_2
/bin/ls
/bin/ls
Non-Interactive Mode
$ cat test_ls_2 | ./hsh
hsh main.c shell.c test_ls_2
## Authors
Aymen Haddaji - https://github.com/Aymen-haddaji-hub
Oumayma Bougossa - https://github.com/oumaymabg
Ons Jannet - https://github.com/OnsJannet