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1) mkdir -p ~/bin
2) cp cal ~/bin
3) export PATH="~/bin:$PATH"

or add
export PATH="~/bin:$PATH"
to your ~/.bashrc then execute
source ~/.bashrc


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ʹÓþø¶Ô·¾¶¼´¿É£¬±ÈÈçÄãµÄcalÔÚ/user/XX/bin/Ï£¬ÓÃ/user/XX/bin/calµ÷Óã»»òÕßÄã°ÑϵͳµÄcal¸ÄÒ»ÏÂÃû£¬°ÑÄãµÄ¸´ÖƵ½/usr/binÏ£¬¾Í¿ÉÖ±½ÓÓÃÁË

×Ô¼º´´½¨¸öĿ¼£¬±ÈÈç~/bin
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  struct hostent *hp; 
char AlarmDevIP[20];  
  int x2;

hp = gethostbyname("www.google.com");
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