fork compare to exec in linux c program
pid_t pid=fork()
it has 3 situation for the return result pid
0 child
>0 parent process
<0 fork fail
fork create a new process and it parent live alse when the child process had been created
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read -p "input comand:" command
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;;
*)
echo "what a stupid man!ex>$0 some word"
......
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