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function show()
{
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show             #²»´ø²ÎÊýµÄµ÷Ó÷µ»Øshell±¾ÉíµÄÃû×Ö
show local     #´ø²ÎÊýµ÷ÓÃ.·µº¯Êý±¾ÉíµÄÃû×Ö¼Ó²ÎÊýlocal
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#include<stdio.h>
int main(int argc,char *argv[]){
FILE *file;
char buf[1024],name[20];
int n;
if(argc != 2){
printf("wrong argument\n");
return 1;
}
file=fopen(argv[1],"r");
if(file==NULL){
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