在 C 语言中, 使用 main 函数的输入参数 argc 和 argv 传入命令行参数.
示例代码如下:
/*
* filename: pass_args.c
* This code is modified a little according to the Arun‘s answer in https://stackoverflow.com/questions/3898021/regarding-mainint-argc-char-argv
*/
#include <stdio.h>
int main(int argc, char *argv[])
{
int i = 0;
printf(" argc = %d\n", argc);
for (; i < argc; ++i) {
printf(" argv[ %d ] = %s\n", i, argv[i]);
}
return 0;
}
编译命令为
$ gcc pass_args.c -o pass_args
运行命令及结果如下:
$ ./pass_args arg1 arg2 3
argc = 4
argv[ 0 ] = ./pass_args
argv[ 1 ] = arg1
argv[ 2 ] = arg2
argv[ 3 ] = 3
Python 语言可以使用 sys 模块中的 argv 变量, 实现相似的功能. 如果需要更高级的命令行参数传递方式, 可以使用 argparse 模块. 使用 sys.argv 的示例代码如下:
#!/usr/bin/env python
# -*- coding: utf8 -*-
from __future__ import print_function
import sys
if __name__ == ‘__main__‘:
print (‘The argument count is %d.‘ % len(sys.argv))
print (‘The argument vectors: ‘)
for i, arg in enumerate(sys.argv):
print (‘ argv[ %d ] = %s‘ % (i, arg))
运行命令及结果如下：
$ python pass_args.py arg1 arg2 3
The argument count is 4.
The argument vectors:
argv[ 0 ] = pass_args.py
argv[ 1 ] = arg1
argv[ 2 ] = arg2
argv[ 3 ] = 3
1. Regarding ‘main(int argc, char *argv[])‘ [duplicate]. https://stackoverflow.com/questions/3898021/regarding-mainint-argc-char-argv
2. Entry point - Wikipedia. https://en.wikipedia.org/wiki/Entry_point
3. Python - Command Line Arguments. https://www.tutorialspoint.com/python/python_command_line_arguments.htm
原文：https://www.cnblogs.com/klchang/p/9309402.html