File Format Specifications for .PL

The .PL file format is primarily associated with Perl scripts, which are text-based scripting files used for programming in the Perl language. However, the format itself is not a binary or structured format with internal headers or fields; it's plain text. There are no "intrinsic" content-based properties defined in a standard specification for .PL files beyond being ASCII or UTF-8 text. Based on the query, I interpreted "properties of this file format intrinsic to its file system" as the metadata attributes provided by the file system for any file, including .PL files. These are the standard stat properties available on most operating systems (e.g., Unix-like systems or Windows via equivalent APIs).

List of all the properties of this file format intrinsic to its file system:

• Mode (permissions, e.g., read/write/execute for owner/group/others)
• Inode number (unique file identifier on the file system)
• Device ID (identifier of the device containing the file)
• Number of hard links (number of names pointing to the same inode)
• Owner UID (user ID of the file owner)
• Group GID (group ID of the file)
• Size in bytes (total size of the file)
• Last access time (timestamp when the file was last accessed)
• Last modification time (timestamp when the file content was last modified)
• Creation time (timestamp when the file was created; note: on some systems, this is the last metadata change time)

Two direct download links for files of format .PL:

• https://filesamples.com/samples/code/pl/sample1.pl
• https://filesamples.com/samples/code/pl/sample2.pl

Ghost blog embedded HTML JavaScript for drag and drop to dump properties:
Here's a simple HTML page with embedded JavaScript that allows dragging and dropping a .PL file. It dumps the available file system properties (limited in browsers to what the File API provides: name, size, type, lastModified). Assume this is embedded in a Ghost blog post or similar.

Drag and Drop .PL File

Python class:
Here's a Python class that opens a .PL file, retrieves the file system properties using os.stat, prints them to console, and includes basic read/write methods (read fetches content, write creates or overwrites a .PL file with content). Decode is handled as text reading.

import os
import time

class PLFileHandler:
    def __init__(self, filepath):
        if not filepath.endswith('.pl'):
            raise ValueError("File must have .pl extension")
        self.filepath = filepath
        self.properties = self._get_properties()

    def _get_properties(self):
        stat = os.stat(self.filepath)
        return {
            'mode': oct(stat.st_mode),
            'inode': stat.st_ino,
            'device_id': stat.st_dev,
            'num_links': stat.st_nlink,
            'owner_uid': stat.st_uid,
            'group_gid': stat.st_gid,
            'size': stat.st_size,
            'last_access': time.ctime(stat.st_atime),
            'last_modification': time.ctime(stat.st_mtime),
            'creation_time': time.ctime(stat.st_ctime),
        }

    def print_properties(self):
        for key, value in self.properties.items():
            print(f"{key}: {value}")

    def read(self):
        with open(self.filepath, 'r') as f:
            return f.read()

    def write(self, content):
        with open(self.filepath, 'w') as f:
            f.write(content)
        # Update properties after write
        self.properties = self._get_properties()

# Example usage
# handler = PLFileHandler('example.pl')
# handler.print_properties()
# content = handler.read()
# handler.write('new content')

Java class:
Here's a Java class that opens a .PL file, retrieves file system properties using Files.getAttribute, prints them to console, and includes basic read/write methods (read fetches content, write creates or overwrites).

import java.io.*;
import java.nio.file.*;
import java.nio.file.attribute.*;
import java.time.Instant;

public class PLFileHandler {
    private final Path filepath;
    private final BasicFileAttributes attrs;

    public PLFileHandler(String filepathStr) throws IOException {
        this.filepath = Paths.get(filepathStr);
        if (!filepathStr.endsWith(".pl")) {
            throw new IllegalArgumentException("File must have .pl extension");
        }
        this.attrs = Files.readAttributes(filepath, BasicFileAttributes.class);
    }

    public void printProperties() throws IOException {
        PosixFileAttributes posixAttrs = null;
        try {
            posixAttrs = Files.readAttributes(filepath, PosixFileAttributes.class);
        } catch (UnsupportedOperationException e) {
            // Fallback for non-POSIX systems like Windows
        }
        System.out.println("mode: " + (posixAttrs != null ? posixAttrs.permissions() : "N/A"));
        System.out.println("inode: " + attrs.fileKey()); // Approximation for inode
        System.out.println("device_id: N/A"); // Not directly available
        System.out.println("num_links: " + (posixAttrs != null ? posixAttrs.linkCount() : "N/A"));
        System.out.println("owner_uid: " + (posixAttrs != null ? posixAttrs.owner().getName() : "N/A")); // UID as name
        System.out.println("group_gid: " + (posixAttrs != null ? posixAttrs.group().getName() : "N/A")); // GID as name
        System.out.println("size: " + attrs.size());
        System.out.println("last_access: " + Instant.ofEpochSecond(attrs.lastAccessTime().toMillis() / 1000));
        System.out.println("last_modification: " + Instant.ofEpochSecond(attrs.lastModifiedTime().toMillis() / 1000));
        System.out.println("creation_time: " + Instant.ofEpochSecond(attrs.creationTime().toMillis() / 1000));
    }

    public String read() throws IOException {
        return new String(Files.readAllBytes(filepath));
    }

    public void write(String content) throws IOException {
        Files.write(filepath, content.getBytes());
    }

    public static void main(String[] args) throws IOException {
        // Example usage
        // PLFileHandler handler = new PLFileHandler("example.pl");
        // handler.printProperties();
    }
}

JavaScript class (for Node.js):
Here's a JavaScript class for Node.js that opens a .PL file, retrieves file system properties using fs.statSync, prints them to console, and includes basic read/write methods (read fetches content, write creates or overwrites).

const fs = require('fs');

class PLFileHandler {
  constructor(filepath) {
    if (!filepath.endsWith('.pl')) {
      throw new Error('File must have .pl extension');
    }
    this.filepath = filepath;
    this.properties = this._getProperties();
  }

  _getProperties() {
    const stat = fs.statSync(this.filepath);
    return {
      mode: stat.mode.toString(8),
      inode: stat.ino,
      device_id: stat.dev,
      num_links: stat.nlink,
      owner_uid: stat.uid,
      group_gid: stat.gid,
      size: stat.size,
      last_access: new Date(stat.atimeMs).toISOString(),
      last_modification: new Date(stat.mtimeMs).toISOString(),
      creation_time: new Date(stat.birthtimeMs).toISOString(),
    };
  }

  printProperties() {
    for (const [key, value] of Object.entries(this.properties)) {
      console.log(`${key}: ${value}`);
    }
  }

  read() {
    return fs.readFileSync(this.filepath, 'utf8');
  }

  write(content) {
    fs.writeFileSync(this.filepath, content, 'utf8');
    // Update properties after write
    this.properties = this._getProperties();
  }
}

// Example usage
// const handler = new PLFileHandler('example.pl');
// handler.printProperties();

C class (struct-based, since C doesn't have classes; using a struct with functions):
Here's a C "class" using a struct, that opens a .PL file, retrieves file system properties using stat, prints them to console, and includes basic read/write methods (read fetches content into a buffer, write creates or overwrites). Note: Write updates the file but doesn't handle full decode as it's text.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>

typedef struct {
    char *filepath;
    struct stat properties;
} PLFileHandler;

PLFileHandler* PLFileHandler_create(const char *filepath) {
    if (strstr(filepath, ".pl") != filepath + strlen(filepath) - 3) {
        fprintf(stderr, "File must have .pl extension\n");
        return NULL;
    }
    PLFileHandler *handler = malloc(sizeof(PLFileHandler));
    handler->filepath = strdup(filepath);
    if (stat(handler->filepath, &handler->properties) != 0) {
        free(handler->filepath);
        free(handler);
        return NULL;
    }
    return handler;
}

void PLFileHandler_printProperties(PLFileHandler *handler) {
    if (handler == NULL) return;
    char time_buf[64];
    printf("mode: %o\n", handler->properties.st_mode);
    printf("inode: %ld\n", handler->properties.st_ino);
    printf("device_id: %ld\n", handler->properties.st_dev);
    printf("num_links: %ld\n", handler->properties.st_nlink);
    printf("owner_uid: %d\n", handler->properties.st_uid);
    printf("group_gid: %d\n", handler->properties.st_gid);
    printf("size: %ld\n", handler->properties.st_size);
    strftime(time_buf, sizeof(time_buf), "%Y-%m-%d %H:%M:%S", localtime(&handler->properties.st_atime));
    printf("last_access: %s\n", time_buf);
    strftime(time_buf, sizeof(time_buf), "%Y-%m-%d %H:%M:%S", localtime(&handler->properties.st_mtime));
    printf("last_modification: %s\n", time_buf);
    strftime(time_buf, sizeof(time_buf), "%Y-%m-%d %H:%M:%S", localtime(&handler->properties.st_ctime));
    printf("creation_time: %s\n", time_buf);
}

char* PLFileHandler_read(PLFileHandler *handler) {
    if (handler == NULL) return NULL;
    FILE *f = fopen(handler->filepath, "r");
    if (!f) return NULL;
    fseek(f, 0, SEEK_END);
    long size = ftell(f);
    fseek(f, 0, SEEK_SET);
    char *content = malloc(size + 1);
    fread(content, 1, size, f);
    content[size] = '\0';
    fclose(f);
    return content;
}

int PLFileHandler_write(PLFileHandler *handler, const char *content) {
    if (handler == NULL) return -1;
    FILE *f = fopen(handler->filepath, "w");
    if (!f) return -1;
    fprintf(f, "%s", content);
    fclose(f);
    // Update properties
    stat(handler->filepath, &handler->properties);
    return 0;
}

void PLFileHandler_destroy(PLFileHandler *handler) {
    if (handler) {
        free(handler->filepath);
        free(handler);
    }
}

// Example usage
// int main() {
//   PLFileHandler *handler = PLFileHandler_create("example.pl");
//   if (handler) {
//     PLFileHandler_printProperties(handler);
//     PLFileHandler_destroy(handler);
//   }
//   return 0;
// }