Simple shell is a fundamental command line user interface where you wich provides all basic built-in commands. This project is our own simple shell with basic commands that was created based on SH. Simple shell handle environment
- Git clone this repository
$ git clone https://github.com/gchuinard/simple_shell.git- Compile all files to get executable file
$ gcc *.c -o hsh- Execute
$ ./hshInteractive mode allows you to enter as many commands as you want.
Also allows you to exit in two ways, press CTRL + D or
exit built-in command. $ exit
To run simple shell just execute the command below
$ ./hshIt will display this screen that means you are inside our shell
$: $ ./hsh
$: echo display something
display something
$:Non interactive mode allows you to run a simple command.
$ echo "the command you want to run" | ./hsh $ echo "pwd" | ./hsh
*Display your current directory*File mode allows you to enter many commands as you want with the intermediary of a file. You can write in your file one command by line. The shell will execute them one by one. You don't need to exit at the end.
Create a file "my_file"
Write the commands you want to execute
ls
pwd
echo Hello
Execute the file mode:
$ ./hsh my_file
*Display files and directories in your current directory*
*Display the path to your current directory*
Hello
$More information about each command use help. $: help built-in_command
$: ./hsh
$: help exit
exit: exit [n]
Exit the shell.
Exits the shell with a status of N. If N is omitted, the exit status
is that of the last command executed.
$:| Command | Description |
|---|---|
| exit | Exit simple shell |
| help | Display help of built-in command |
| env | Display environment variables |
| cd | Change directory |
| setenv | Set environment variable value or create a new one |
| unsetenv | Delete environment variable |
| alias | Set an alias or create a new one |
| unalias | Delete an alias |
| history | Display previous commands |
There are different posible exit status, this deppende on the success of the last command.
0: Success exit.
2: Error execute command.
126: Permission denied.
127: not found.
$ ./hsh
$: ls -l
-rwxrw-r-- 1 vagrant vagrant 25 Nov 20 00:00 hsh
$: $ ./custom_name_shell
$: echo 123
123
$: $ ./hsh
$: cd /tmp
$: pwd
/tmp
$: $ echo "/bin/ls -l" | ./hsh
-rwxrw-r-- 1 vagrant vagrant 25 Nov 20 00:00 hsh
$ $ echo "pwd" | ./hsh
/root/simple_shell
$ $ echo "exit 7" | ./hsh
$ echo $?
7
$Create a file "my_file"
Write the commands you want to execute
ls
pwd
echo Hello
Execute the file mode:
$ cat my_file | ./hsh
*Display files and directories in your current directory*
*Display the path to your current directory*
Hello
$Help_files: Directory containing help files of built-in commands.
Matt Scetbun a.k.a @matt969696.
Gautier Chuinard a.k.a @gchuinard.