env.c

#include <stdio.h>

int main(int argc, char const *argv[], char const *envp[])
{
	int i;
	char **env;
	FILE *fp;
	
	fp = argc == 2 ? fopen(argv[1], "w") : stdout;
	
	for (i = 0; i < argc; ++i)
		fprintf(fp, "argc[%d] = '%s'\n", i, argv[i]);
	
	for (env = envp; *env; ++env)
		fprintf(fp, "%s\n", *env);
	
	// none closing
		
	return 0;
}