如果argc不等于1就输出 Usage : find ......
那么argc =1时,原理上知识文件名了啊~~
那么else后面的怎么办呢~?
#include <stdio.h>
#include <string.h>
#define MAXLINE 1000
int getline(char *line, int max);
/* find: print lines that match pattern from 1st arg */
main(int argc, char *argv[])
{
char line[MAXLINE];
long lineno = 0;
int c, except = 0, number = 0, found = 0;
while (--argc > 0 && (*++argv)[0] == '-')
while (c = *++argv[0])
switch (c) {
case 'x':
except = 1;
break;
case 'n':
number = 1;
break;
default:
printf("find: illegal option %c\n", c);
argc = 0;
found = -1;
break;
}
if (argc != 1)
printf("Usage: find -x -n pattern\n");
else
while (getline(line, MAXLINE) > 0) {
lineno++;
if ((strstr(line, *argv) != NULL) != except) {
if (number)
printf("%ld:", lineno);
printf("%s", line);
found++;
}
}
return found;
}