0x16. C - Simple Shell TASK : ---------mandatory-------- Betty would be proud Simple shell 0.1 Simple shell 0.2 Simple shell 0.3 Simple shell 0.4 Simple shell 1.0 ---------advanced------- Simple shell 0.1.1 Simple shell 0.2.1 Simple shell 0.4.1 setenv, unsetenv cd ; && and || alias Variables Comments File as input