3/7作业
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <wait.h>
void getstring(char *buf,int size)
{
fgets(buf,size,stdin);
int len = strlen(buf);
if(buf[len-1]==10)
{
buf[len-1] = 0;
}
}
int main(int argc, const char *argv[])
{
while(1)
{
int ret = fork();
if(ret>0)
{
char *username = getlogin();
char hostname[128]={0};
char path[128]={0};
gethostname(hostname,128);
getcwd(path,128);
printf("\033[1;32;10m%s@%s\033[0m:\033[1;34;10m%s\033[0m$ ",username,hostname,path);
fflush(stdout);
wait(0);
}
else if(ret==0)
{
char cmd[256]={0};
getstring(cmd,256);
char *arg[32]={0};
int i = 0;
char *res = NULL;
do
{
if(res==NULL)
{
res=strtok(cmd," ");
}
else
{
res=strtok(NULL," ");
}
if(res==NULL)
{
break;
}
arg[i]=res;
i++;
}
while(1);
if(strcmp(arg[0],"cd")==0)
{
if(arg[1]==0 || strcmp(arg[1],"~")==0)
{
chdir("/home/ubuntu");
}
else
{
chdir(arg[1]);
}
}
else
{
execvp(arg[0],arg);
}
}
else
{
printf("创建失败\n");
return 1;
}
}
return 0;
}
原文地址:https://blog.csdn.net/hundunheimer/article/details/136523647
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