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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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1.vi /etc/sysconfig/i18n
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Linux Shell ±Ê¼Ç¶þ(Ñ­»·½á¹¹)

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read -p "input comand:" command
case $command in
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echo "fix system"
;;
"fuck")
echo "fuck you"
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*)
echo "what a stupid man!ex>$0 some word"
......

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