sos
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shitty operating system ...---...
I have created the history command for SOS, which is not present. The command and output will look like below... 
Basic shell commands like wc, head and tail don't exist.
Added a sleep function and a get uptime function. The sleep function will be neccicary if you ever plan to add multithreading. Also, I rewrote some of the timer code...
There is no sleep function for the timer which is necessary if you want to enable multithreading later on
In order to see the history of the entered commands, "history" command can be implemented which is missing in your OS whose output in UNIX-like operating system looks like below....