1 #include<stdio.h>  
 2 #include<stdlib.h>
 3 
 4 int main(int argc,char *argv[]) 
 5 { 
 6     if(argc==1 || argc>2)
 7     { 
 8         printf("Please input the name of the file 
 9                 you want to edit, for example:./edit fillen\n"); 
10         printf("argv[0] is %s\n",argv[0]);
11     } 
12 
13     if(argc==2) 
14     { 
15         printf("Now EDIT %s\n",argv[1]); 
16         printf("argv[0] is %s\n",argv[0]);
17         printf("argv[1] is %s\n",argv[1]);
18     } 
19 
20     exit(0);
21 }