getopt

I'm implementing a command line tool, and I need to be able to handle a bunch of options. Some of the options must terminate the program after they're done. For example I have options a, b and c. If a and b terminate after their done, and I give the command ./myprogram -bca [file] Is there a way to give "a" precedence in a situation like this using getopt()? EDIT: I solved this by running a switch on the options and set a flag if an option was selected. Then sent all the flags to a function that looks at the flags in order. There are two main ways to process the options read by getopt() . One

getopt 模块用于解析 sys中的命令行参数。支持unix的 getopt() 函数的功能,并且提供了一个函数 getopt(args,options[,long_options]) 解析命令行参数，要去掉开头的运行程序引用。所以通常将args赋值为 sys.argv[1:] 。options参数可以跟一串字母，每个字母表示一个选项，含有后续值的选项后面加个冒号。 long_options，格式是字符串列表，选项名中不需要包含前导的"--"。长选项需要在参数后附带"="，然后跟一个值。如果只希望接受长选项，可以把options设置成空字符串。长选项会尽可能长的识别， 返回值两个元素：一个(option,value)列表，剩余的未解析参数。每个(option,value)对返回时，选项名包含前导的"-"或"--"，选项参数作为第二个参数，或者为空字符串。它们在返回列表中出现的顺序与在命令行出现的顺序相同。长短选项混合。 更多技术资讯可关注：gzicast 来源： https://www.cnblogs.com/heimaguangzhou/p/11670725.html

/* 获取字符编码 */ #include <stdio.h> #include <stdlib.h> /* calloc()函数头文件 */ #include <string.h> #include <assert.h> #include "uchardet.h" void test() { uchardet_t ud; const char *p = "一开始 金星实际上 和 地球 是姊妹星球 。"; const char *pcCode = NULL; do { //1.初始化 ud = uchardet_new(); //2.分析样本字符串 if (uchardet_handle_data(ud, p, strlen(p))) { printf("---uchardet_handle_data() failed----\n"); break; } //3.关闭样本分析 uchardet_data_end(ud); //4.打印当前字符串的编码 pcCode = uchardet_get_charset(ud); if (pcCode) { printf("------current code is [%s]------------\n", pcCode); } else { printf("---uchardet_get_charset() failed----\n");

And does Dart have a getopt library? Tomas Kulich Using Options is no longer an option, use: void main(List<String> args) { print(args); } To get executable, use Platform.executable (Platform comes from dart:io) For parsing arguments passed to main, use this cool package Edit: This is no longer valid, see accepted answer above. See Options . http://api.dartlang.org/dart_io/Options.html List<String> argv = (new Options()).arguments; igor // dart 1.0 import 'dart:io'; void main(List<String> args) { String exec = Platform.executable; List<String> flags = Platform.executableArguments; Uri script =

This question already has an answer here: C getopt multiple value 4 answers is there an alternative way to pass two arguments to an option as a single string when using getopt ? Normally I would do the following: ./command -o "key value" [command arguments] Then I would have to split the argument string explicitly while ((op = getopt(argc, argv, "o:")) != EOF) { switch (op) { case 'o': char* result = NULL; result = strtok_r(optarg," "); while(result) { /* DO STUFF */ result = strtok(NULL," "); } break; default: printUsage() break; } So, I am wondering if is it possible to do the following: .

I'm trying to create a basic shell with builtin commands, and I'm having some issues with getopt. Here is the output (using valgrind): $ mkdir -p foo/bar mkdir -p foo/bar FLAGON $ mkdir -p foo/test mkdir -p foo/test ==15377== Invalid read of size 1 ==15377== at 0x5201BBE: _getopt_internal_r (in /usr/lib/libc-2.17.so) ==15377== by 0x5202CEA: _getopt_internal (in /usr/lib/libc-2.17.so) ==15377== by 0x5202D37: getopt (in /usr/lib/libc-2.17.so) ==15377== by 0x40351A: shell_ns_cmd_mkdir (shell.c:542) ==15377== by 0x403AB4: normal_shell_cb (shell.c:610) ==15377== by 0x402E8E: shell_mainloop (shell.c

I have a program where you enter an option -d and then whether or not you supply a non-optional argument after the option, do something. Heres my code: #include <stdio.h> #include <getopt.h> #include <stdlib.h> #define OPT_LIST "d::" int main (int argc, char *argv[]) { int c; char string[] = "blah"; while ((c = getopt (argc, argv, OPT_LIST)) != -1) { switch (c) { case 'd': printf("%s\n", optarg); break; case '?': fprintf(stderr, "invalid option\n"); exit(EXIT_FAILURE); } } } So if you enter a non-optional argument after the option, it prints the argument. But I want it to print out the char