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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 ......

linux date ÃüÁîÏê½â

linux date ÃüÁîÏê½â
 
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date [-u] [-d datestr] [-s datestr]
[--utc] [--universal] [--date=datestr] [--set=datestr] [--help]
[--version] [+FORMAT] [MMDDhhmm[[CC]YY][.ss]]
˵Ã÷ :
date ¿ÉÒÔÓÃÀ´ÏÔʾ»òÉ趨ϵͳµÄÈÕÆÚÓëʱ¼ä£¬ÔÚÏÔʾ·½Ã棬ʹÓÃÕß¿ÉÒÔÉ趨ÓûÏÔʾµÄ¸ñʽ£¬¸ñʽÉ趨Ϊһ¸ö¼Óº ......

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Linux ÄÚ´æ°ó¶¨ÔÚ¾Ö²¿´æ´¢Æ÷µÄʵÏÖ


3.2.1 Linux ÄÚ´æ°ó¶¨ÔÚ¾Ö²¿´æ´¢Æ÷µÄʵÏÖ×ÜÌå²½Öè
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Linux ÄÚ´æ°ó¶¨ÔÚ¾Ö²¿´æ´¢Æ÷µÄʵÏÖ


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