The simple shell is a custom shell with unique features. It as exact same output as sh (/bin/sh) as well as the exact same error output.

• Supports a list of allowed functions and system calls:

  • access (man 2 access)
  • chdir (man 2 chdir)
  • close (man 2 close)
  • closedir (man 3 closedir)
  • execve (man 2 execve)
  • exit (man 3 exit)
  • _exit (man 2 exit)
  • fflush (man 3 fflush)
  • fork (man 2 fork)
  • free (man 3 free)
  • getcwd (man 3 getcwd)
  • getline (man 3 getline)
  • getpid (man 2 getpid)
  • isatty (man 3 isatty)
  • kill (man 2 kill)
  • malloc (man 3 malloc)
  • open (man 2 open)
  • opendir (man 3 opendir)
  • perror (man 3 perror)
  • read (man 2 read)
  • readdir (man 3 readdir)
  • signal (man 2 signal)
  • stat (xstat) (man 2 stat)
  • lstat (lxstat) (man 2 lstat)
  • fstat (fxstat) (man 2 fstat)
  • strtok (man 3 strtok)
  • wait (man 2 wait)
  • waitpid (man 2 waitpid)
  • wait3 (man 2 wait3)
  • wait4 (man 2 wait4)
  • write (man 2 write)

• Supports both interactive mode and non-interactive mode.

Your shell should work like this in interactive mode:

$ ./hsh
($) /bin/ls
hsh main.c shell.c
($)
($) exit
$

And this way in non-interactive mode:

$ echo "/bin/ls" | ./hsh
hsh main.c shell.c test_ls_2
$
$ cat test_ls_2
/bin/ls
/bin/ls
$
$ cat test_ls_2 | ./hsh
hsh main.c shell.c test_ls_2
hsh main.c shell.c test_ls_2
$

It hhas the exact same output as sh (/bin/sh) as well as the exact same error output. The only difference is when you print an error, the name of the program must be equivalent to your argv[0] (See example below)

Example of error with sh:

$ echo "qwerty" | /bin/sh
/bin/sh: 1: qwerty: not found
$ echo "qwerty" | /bin/../bin/sh
/bin/../bin/sh: 1: qwerty: not found
$

Same error with the hsh program:

$ echo "qwerty" | ./hsh
./hsh: 1: qwerty: not found
$ echo "qwerty" | ./././hsh
./././hsh: 1: qwerty: not found
$

1. Clone the repository https://github.com/khairatAA/simple_shell.git
2. Navigate to the directory cd simple_shell
3. Compile the files using a C compiler to build the shell executable: gcc -Wall -Werror -Wextra -pedantic -std=gnu89 *.c -o hsh

Execute the generated hsh binary to start the shell.

• To execute in interactive mode: ./hsh
• To execute in non-interactive mode: echo "command" | ./hsh
• Pass in commands as you would in the sh shell.

• Khairat Adesina khairatadesina01@gmail.com
• Joshua Oseghale aigbokhaebholojoshua@gmail.com