0x15. C - Simple Shell

Description

command language interpreter that executes commands read from the standard input device (keyboard) or from a file.

Usage

• ./hsh

Example

Interactive mode

vagrant@vagrant-ubuntu-trusty-64 ./hsh Ghost-in-the-shell-1 ls hsh main.c shell.c Ghost-in-the-shell-1 Ghost-in-the-shell-1 exit vagrant@vagrant-ubuntu-trusty-64

non-interactive mode:

vagrant@vagrant-ubuntu-trusty-64 echo "ls" | ./hsh hsh main.c shell.c test_ls_2 vagrant@vagrant-ubuntu-trusty-64 vagrant@vagrant-ubuntu-trusty-64 cat test_ls_2 ls ls vagrant@vagrant-ubuntu-trusty-64 vagrant@vagrant-ubuntu-trusty-64 cat test_ls_2 | ./hsh hsh main.c shell.c test_ls_2 hsh main.c shell.c test_ls_2 vagrant@vagrant-ubuntu-trusty-64

commands

ls

• list directory contents

vagrant@vagrant-ubuntu-trusty-64 ./hsh Ghost-in-the-shell-1 ls hsh main.c shell.c

cat

• concatenate files and print on the standard output

vagrant@vagrant-ubuntu-trusty-64 ./hsh Ghost-in-the-shell-1 cat README.md 0x15. C - Simple Shell

pwd

• print name of current/working directory

vagrant@vagrant-ubuntu-trusty-64 ./hsh Ghost-in-the-shell-1 pwd /home/vagrant/simple_shell/

env

• run a program in a modified environment

vagrant@vagrant-ubuntu-trusty-64 ./hsh Ghost-in-the-shell-1 env USER=vagrant ...

exit

• cause normal process termination with last command status

vagrant@vagrant-ubuntu-trusty-64 ./hsh Ghost-in-the-shell-1 exit 98 vagrant@vagrant-ubuntu-trusty-64 echo $? 98 vagrant@vagrant-ubuntu-trusty-64

Errors

vagrant@vagrant-ubuntu-trusty-64 echo "qwerty" | ./hsh ./hsh: 1: qwerty: not found vagrant@vagrant-ubuntu-trusty-64 echo "qwerty" | ./././hsh ./././hsh: 1: qwerty: not found vagrant@vagrant-ubuntu-trusty-64

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Author

• JaiberS - JaiberS
• HeimerR - HeimerR