move.c

// A re-implementation of the Linux mv command

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

void print_error(char *this, char *filename1, char *filename2){
    fprintf(stderr, "%s cannot move %s to %s\n%s\n", 
            this, filename1, filename2, strerror(errno));
    exit(EXIT_FAILURE);
}

void print_usage(char *this){
    fprintf(stderr, "SYNTAX ERROR:\nUsage: %s [old filename] [new filename]\n", this);
    exit(EXIT_FAILURE);
}

int main(int argc, char *argv[]){
	errno = 0;
    FILE *fpr, *fpw;
	char ch;

	if(argc != 3){
		print_usage(argv[0]);
	}
    else if(rename(argv[1], argv[2]) == -1){
        print_error(argv[0], argv[1], argv[2]);
    }
    return 0;
}