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date.c
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date.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <time.h>
int main(int argc, char** argv) {
time_t T = time(NULL);
struct tm* present_time;
int i;
for (i = 1; i < argc; i++) {
if (argv[i][strlen(argv[i]) - 1] == '\n')
argv[i][strlen(argv[i]) - 1] = '\0';
}
int option_flag = 0;
if (argc > 1) {
option_flag = 1;
}
if (argc > 2 && strcmp(argv[1], "-r") ||
argc > 3 && !strcmp(argv[1], "-r")) {
printf("Too many arguments!!\n");
return 0;
}
if (!option_flag) {
present_time = localtime(&T);
printf("%s", asctime(present_time));
}
else {
if (!strcmp(argv[1], "-u")) {
present_time = gmtime(&T);
printf("%s", asctime(present_time));
}
else if (!strcmp(argv[1], "-r")) {
char* file_path = argv[2];
struct stat attr;
int result = stat(file_path, &attr);
if (!result) printf("%s", ctime(&attr.st_mtime));
else printf("File '%s' doesn't exist!!\n", file_path);
}
else {
printf("Invalid option '%s'!!\n", argv[1]);
}
}
return 0;
}