This small program became from an email request for support for a Windows Server and I found it good to share with you.
Objetives:
Hi Pablo,
For Monday, could I ask you to look into something completely different but which will help us anyway.
On a windows machine, I want to be able to run a CMD script which will save some files in a folder that has a date stamp filename e.g. 20231015
So… What I need is another script (CMD file) that will accept the parent path as a parameter and only keep the subfolders that have date filenames up to N days in the past (any subfolder with a dated name older than that is deleted).
Example:
I have a path of D:/TEST
And inside that there are subfolders accumulating daily e.g.
D:/TEST/20231015
D:/TEST/20231014
D:/TEST/20231013
D:/TEST/20231012
D:/TEST/20231011
D:/TEST/20231010
D:/TEST/20231009
D:/TEST/20231008
D:/TEST/20231007
(you get the idea!)
Now I want to run a script such as “PURGE.CMD” with a parameter of parent path and another parameter with number of days to keep e.g. 7
and for any subfolders (and their contents) with a folder name that represents a date older than 7 days is then deleted.
Which would leave just:
D:/TEST/20231015
D:/TEST/20231014
D:/TEST/20231013
D:/TEST/20231012
D:/TEST/20231011
D:/TEST/20231010
D:/TEST/20231009
Probably classic stuff but I don’t have time to do this and thought you may enjoy a simple(ish) task!
This has to be delivered as a windows CMD script that takes a command line parameter so I can run:
PURGE.CMD D:/TEST 7
Cheers,
M.
Check if local machine has GCC compiler as the fllowing example which should output:
C:\> gcc --version
gcc (Windows 10.2.0-14) 10.2.0
Copyright (C) 2022 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
C:\> gcc -o PURGE.CMD main.c
C:\> ./PURGE.CMD
Program
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <dirent.h>
#include <errno.h>
int main(int argc, char *argv[]) {
int error=0;
// VALIDATION
if(argc == 1 || argc == 2){
printf("Error - To few arguments! \n");
error=1;
}
if(argc > 3){
printf("Error - Exceeded arguments! \n");
error=1;
}
if(error == 1){
printf("Program expects two arguments: \n");
printf("1) Root directory path.\n");
printf("2) Days to count (integer) to make the purge.\n");
printf("\n");
return 1;
}
// VALIDATION OF DIRECTORY
DIR* dir=opendir(argv[1]);
if (!dir) {
printf("Program expects two valid arguments: \n");
printf("1) Root directory path doesn't exist or mismatch. [FAIL]\n");
printf("2) Days to count (integer) to make the purge.\n");
printf("\n");
return 1;
}
// VALIDATION OF DAY
time_t t = time(NULL);
struct tm tm = *localtime(&t);
int count=atoi(argv[2]);
if (!count) {
printf("Program expects two valid arguments: \n");
printf("1) Root directory path: %s [O.K.]\n", argv[1]);
printf("2) Days to count (integer) to make the purge. [FAIL]\n");
printf("\n");
return 1;
}
if (count < 1 || count > 31) {
printf("Program expects two valid arguments: \n");
printf("1) Root directory path: %s [O.K.]\n", argv[1]);
printf("2) Days to count value must be between (1) and (31). [FAIL]\n");
printf("\n");
return 1;
}
// EXECUTION
// OS SYSTEM
#if defined(_WIN32) || defined(_WIN64)
// Windows code
char cd[1];
sprintf(cd,"%s", "\\");
#else
// GNU/Linux code
char cd[1];
sprintf(cd,"%s", "/");
#endif
// VALUES
int y_int=tm.tm_year + 1900;
int m_int=tm.tm_mon + 1;
int d_int=tm.tm_mday;
int dl_int=tm.tm_mday - count;
// INFO
printf("Executing PURGE...\n");
printf("Location: %s\n", argv[1]);
printf("Today directory's name value: %d%02d%02d\n", y_int, m_int, d_int);
printf("Purging directories name value older than %d%02d%02d (%s days)\n", y_int, m_int, dl_int, argv[2]);
printf("\n");
// PROCEEDING
int i;
char target[256];
for(i = 1; i < 32; ++i){
struct dirent *de;
if(i >= dl_int){
target[0] = (char) 0;
sprintf(target,"%s%s%d%02d%02d", argv[1], cd, y_int, m_int, i);
DIR *dr = opendir(target);
if(dr){
printf("%s [KEEP]\n", target);
}
}
if(i < dl_int){
target[0] = (char) 0;
sprintf(target,"%s%s%d%02d%02d", argv[1], cd, y_int, m_int, i);
DIR *dr = opendir(target);
if(!dr){
continue;
}
int deleted = 0;
char cmd[256] = {0};
sprintf(cmd, "rm -rf %s 2>&1", target);
deleted=system(cmd);
if(deleted == 0){
printf("%s [DELETED]\n", target);
}else{
printf("%s [FAIL]\n", target);
}
}
}
printf("\n");
return 0;
}
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