命令行参数和文件输入 [英] Command Line Arguments and File Input

问题描述

我有一个可怕的时间与命令行参数的最后一个学期文件输入，我需要利用它为我工作的练习。我有codeD一个简单的shell只是为了得到它的工作：

I had a terrible time with file input from command line arguments last semester and I need to utilize it for an exercise that I am working on. I have coded a simple shell just to get it working:

prob_5.c

#include <stdio.h>

int main(int argc, char *argv[]) {
int i;
FILE *fp;
int c;

for (i = 1; i < argc; i++) {
    fp = fopen(argv[i], "r");

    if (fp == NULL) {
        fprint(stderr, "cat: can't open %s\n", argv[i]);
        continue;
    }

    while ((c = getc(fp)) != EOF) {
        putchar(c);
    }

    fclose(fp);
}

return 0;
}

我似乎无法记住的命令是从从命令行调用我的程序。我曾尝试：

I can't seem to remember what the commands are for invoking my program from the command line. I have tried:

gcc -o prob_5 -g -ansi prob_5.c

我已经重新格式化，因为上学期我的电脑，所以也许我缺少一个系统路径？

I have reformatted my computer since last semester, so perhaps I am missing a System Path?

推荐答案

它看起来像你的程序只是希望有一个说法：文件名。您也可以先编译它。

It looks like your program just expects one argument: the file name. You also have to compile it first.

$ gcc -o prob_5 prob_5.c
$ ./prob_5 input_file.txt

如果它没有编译，那么你有另外一个问题。什么是当你执行 GCC ？

If it is not compiling, then you have another issue. What is returned when you execute gcc?

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