Task 145: .DO File Format
Task 145: .DO File Format
File Format Specifications for the .DO File Format
The .DO file format is primarily associated with Stata do-files, which are text-based scripts containing commands for data analysis and management in the Stata statistical software. According to documentation from Stata, a .DO file is a standard text file that can be created or edited using any text editor. It has no binary structure or fixed header; instead, it consists of ASCII or UTF-8 encoded text with Stata-specific syntax for commands, comments, and optional elements such as version declarations and delimiters. The format supports nested execution of other do-files, argument passing, error handling, and logging. There are no proprietary binary elements, and the file is executed by Stata via the do or run command.
1. List of Properties of the .DO File Format Intrinsic to Its File System
Since the .DO format is a plain text file, its intrinsic properties are those managed by the underlying file system, similar to any text file. These include metadata attributes that describe the file's state and attributes within the file system. Based on standard file system specifications (e.g., POSIX for Unix-like systems or NTFS for Windows), the key properties are:
- File Name: The name of the file, including the .DO extension.
- File Size: The size of the file in bytes.
- Creation Time: The timestamp when the file was created.
- Modification Time: The timestamp when the file was last modified.
- Access Time: The timestamp when the file was last accessed.
- Owner: The user identifier (UID) or name of the file owner.
- Group: The group identifier (GID) or name associated with the file.
- Permissions: The access mode (e.g., read, write, execute permissions for owner, group, and others, often represented in octal or symbolic notation).
- Inode Number: The file's inode number (on Unix-like systems), which uniquely identifies the file within the file system.
These properties are not unique to .DO files but are inherent to how the file system handles all files. On Windows, equivalents such as file attributes (e.g., read-only, hidden) may apply instead of inode or POSIX permissions.
2. Two Direct Download Links for Files of Format .DO
The following are direct download links to sample .DO files from publicly available Stata resources:
- http://www.principlesofeconometrics.com/poe5/poe5do_files/chap01.do
- http://www.principlesofeconometrics.com/poe5/poe5do_files/chap02.do
These files contain example Stata commands and can be downloaded and executed in Stata for verification.
3. Ghost Blog Embedded HTML JavaScript for Drag-and-Drop .DO File Property Dump
The following is a self-contained HTML page with embedded JavaScript that allows users to drag and drop a .DO file. Upon dropping, it displays the available file system properties accessible in a browser context (limited to basic metadata due to security restrictions; full properties require server-side access). This can be embedded in a Ghost blog post as raw HTML.
4. Python Class for Handling .DO Files
The following Python class opens a .DO file, reads its content (though not necessary for metadata), retrieves and prints the file system properties using os.stat, and supports writing modifications to the file content if needed. Note that writing metadata (e.g., timestamps) requires additional privileges and methods like os.utime.
import os
import time
class DOFileHandler:
def __init__(self, filepath):
self.filepath = filepath
self.properties = {}
def read_properties(self):
stat = os.stat(self.filepath)
self.properties = {
'File Name': os.path.basename(self.filepath),
'File Size': stat.st_size,
'Creation Time': time.ctime(stat.st_ctime),
'Modification Time': time.ctime(stat.st_mtime),
'Access Time': time.ctime(stat.st_atime),
'Owner UID': stat.st_uid,
'Group GID': stat.st_gid,
'Permissions': oct(stat.st_mode)[-3:],
'Inode Number': stat.st_ino
}
def print_properties(self):
for key, value in self.properties.items():
print(f"{key}: {value}")
def read_content(self):
with open(self.filepath, 'r') as f:
return f.read()
def write_content(self, content):
with open(self.filepath, 'w') as f:
f.write(content)
# Example usage:
# handler = DOFileHandler('example.do')
# handler.read_properties()
# handler.print_properties()
# content = handler.read_content()
# handler.write_content(content + '\n// New comment')
5. Java Class for Handling .DO Files
The following Java class opens a .DO file, retrieves and prints file system properties using java.nio.file, and supports reading and writing file content. Note that some properties like inode require POSIX-specific views.
import java.io.*;
import java.nio.file.*;
import java.nio.file.attribute.*;
import java.time.Instant;
public class DOFileHandler {
private final Path filepath;
private BasicFileAttributes attrs;
public DOFileHandler(String filepath) {
this.filepath = Paths.get(filepath);
}
public void readProperties() throws IOException {
attrs = Files.readAttributes(filepath, BasicFileAttributes.class);
}
public void printProperties() throws IOException {
if (attrs == null) readProperties();
System.out.println("File Name: " + filepath.getFileName());
System.out.println("File Size: " + attrs.size());
System.out.println("Creation Time: " + Instant.ofEpochMilli(attrs.creationTime().toMillis()));
System.out.println("Modification Time: " + Instant.ofEpochMilli(attrs.lastModifiedTime().toMillis()));
System.out.println("Access Time: " + Instant.ofEpochMilli(attrs.lastAccessTime().toMillis()));
System.out.println("Is Regular File: " + attrs.isRegularFile());
// POSIX-specific (Unix-like systems)
if (FileSystems.getDefault().supportedFileAttributeViews().contains("posix")) {
PosixFileAttributes posixAttrs = Files.readAttributes(filepath, PosixFileAttributes.class);
System.out.println("Owner: " + posixAttrs.owner().getName());
System.out.println("Group: " + posixAttrs.group().getName());
System.out.println("Permissions: " + PosixFilePermissions.toString(posixAttrs.permissions()));
}
}
public String readContent() throws IOException {
return new String(Files.readAllBytes(filepath));
}
public void writeContent(String content) throws IOException {
Files.write(filepath, content.getBytes());
}
// Example usage:
// public static void main(String[] args) throws IOException {
// DOFileHandler handler = new DOFileHandler("example.do");
// handler.printProperties();
// String content = handler.readContent();
// handler.writeContent(content + "\n// New comment");
// }
}
6. JavaScript Class for Handling .DO Files
The following JavaScript class (for Node.js environment) opens a .DO file, retrieves and prints file system properties using fs.stat, and supports reading and writing file content.
const fs = require('fs');
const path = require('path');
class DOFileHandler {
constructor(filepath) {
this.filepath = filepath;
this.properties = {};
}
readProperties() {
const stat = fs.statSync(this.filepath);
this.properties = {
'File Name': path.basename(this.filepath),
'File Size': stat.size,
'Creation Time': stat.birthtime.toISOString(),
'Modification Time': stat.mtime.toISOString(),
'Access Time': stat.atime.toISOString(),
'Owner UID': stat.uid,
'Group GID': stat.gid,
'Permissions': (stat.mode & 0o777).toString(8),
'Inode Number': stat.ino
};
}
printProperties() {
for (const [key, value] of Object.entries(this.properties)) {
console.log(`${key}: ${value}`);
}
}
readContent() {
return fs.readFileSync(this.filepath, 'utf8');
}
writeContent(content) {
fs.writeFileSync(this.filepath, content);
}
}
// Example usage:
// const handler = new DOFileHandler('example.do');
// handler.readProperties();
// handler.printProperties();
// const content = handler.readContent();
// handler.writeContent(content + '\n// New comment');
7. C Class for Handling .DO Files
The following is a C++ class (as C does not natively support classes; assuming C++ for object-oriented structure) that opens a .DO file, retrieves and prints file system properties using stat, and supports reading and writing file content. Compile with a C++ compiler.
#include <iostream>
#include <fstream>
#include <sys/stat.h>
#include <ctime>
#include <string>
class DOFileHandler {
private:
std::string filepath;
public:
DOFileHandler(const std::string& fp) : filepath(fp) {}
void readProperties() {
struct stat fileStat;
if (stat(filepath.c_str(), &fileStat) == 0) {
std::cout << "File Name: " << filepath.substr(filepath.find_last_of("/\\") + 1) << std::endl;
std::cout << "File Size: " << fileStat.st_size << std::endl;
std::cout << "Creation Time: " << std::ctime(&fileStat.st_ctime);
std::cout << "Modification Time: " << std::ctime(&fileStat.st_mtime);
std::cout << "Access Time: " << std::ctime(&fileStat.st_atime);
std::cout << "Owner UID: " << fileStat.st_uid << std::endl;
std::cout << "Group GID: " << fileStat.st_gid << std::endl;
std::cout << "Permissions: " << std::oct << (fileStat.st_mode & 0777) << std::endl;
std::cout << "Inode Number: " << fileStat.st_ino << std::endl;
} else {
std::cerr << "Error retrieving properties." << std::endl;
}
}
std::string readContent() {
std::ifstream file(filepath);
if (file) {
std::string content((std::istreambuf_iterator<char>(file)), std::istreambuf_iterator<char>());
return content;
}
return "";
}
void writeContent(const std::string& content) {
std::ofstream file(filepath);
if (file) {
file << content;
}
}
};
// Example usage:
// int main() {
// DOFileHandler handler("example.do");
// handler.readProperties();
// std::string content = handler.readContent();
// handler.writeContent(content + "\n// New comment");
// return 0;
// }