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#include <unistd.h>
pid_t fork(void);
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#include "apue.h"
int glob= 6;
char buf[] = "a write to stdout\n";
int main(void){
    int var;
    pid_t pid;
    var = 88;
    if(write(STDOUT_FILENO,buf,sizeof(buf)-1) != sizeof(buf)-1)
         err_sys("fork error");
    printf("before fork\n");
    if((pid = fork()) <0 ){
         err_sys("fork error");
    } else if(pid == 0){
         glob++;
         var++;
    } else {
         sleep(2);
    }
    printf("pid = %d, glob = %d, var = %d\n", getpid(), glob, var);
    exit(0);
}
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/* Note:Your choice is C IDE */
#include "stdio.h"
main(int argc, char *argv[])
{
FILE *fp;
char ch;
int num=0,max;
int line=0;
if((fp=fopen(argv[1],"rt"))==NULL)
{
printf("\nCannot open file strike any key exit!");
getch();
exit(1);
......

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#include <string.h>
#include <stdlib.h>
void get_str(char * p)
{
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