Perl Questions & Answers
Showing 200 of 490 published & verified pages. Each question includes verified code examples with actual output.
- Craft + Programming intermediateKnitting + Perl: Use Perl (the language) to Plan, Resize, Track, and Generate Knitting PatternsVerified with runnable code
- Programming Languages beginnerWho Uses Perl? Real-World Users, Use Cases, and Practical ExamplesVerified with runnable code
- Perl beginnerHow to Write to a File in Perl (open/print, modes, safety, and best practices)Verified with runnable code
- Perl beginnerHow to Load a Module in Perl (use, require, @INC, and Best Practices)Verified with runnable code
- Security intermediateWhat Is a Perl Backdoor? Meaning, Warning Signs, Examples, and Defensive PracticesVerified with runnable code
- Perl beginnerHow to Run Perl Code on macOS (Terminal, Scripts, Shebangs, Modules, and Common Pitfalls)Verified with runnable code
- Programming Languages beginnerHow to Install Perl on Linux (System Packages, perlbrew, and Building from Source)Verified with runnable code
- Perl intermediateHow to Add Elements to an Array in Perl (push, unshift, splice, indexing, and arrayrefs)Verified with runnable code
- Programming / Developer Tools beginnerHow to Install Perl on Windows 10 (Strawberry Perl, ActivePerl, and Common Pitfalls)Verified with runnable code
- Perl beginnerHow to Install Perl Modules on Windows (CPAN, cpanm, Strawberry Perl, ActiveState, local::lib)Verified with runnable code
- Perl / Development Tools beginnerHow to Use Perl on Windows (Install, Run Scripts, CPAN, Editors, Best Practices)Verified with runnable code
- programming_languages intermediateHow Hard Is It to Learn Perl? A Practical, Honest GuideVerified with runnable code
- Perl beginnerHow to Compare Strings in Perl (eq/ne, lt/gt, cmp, case-insensitive, Unicode)Verified with runnable code
- Programming Languages / Perl beginnerUnderstanding `use` in Perl: Modules, Pragmas, Imports, and Compile-Time BehaviorVerified with runnable code
- Developer Tools beginnerHow to Run Perl in Visual Studio Code (VS Code): Setup, Tasks, Debugging, and WorkflowVerified with runnable code
- Perl beginnerHow to Check If a Perl Module Is Installed (and Loadable)Verified with runnable code
- Programming Languages > Perl beginnerPerl qw(): Quote-Words List Literal (How It Works, When to Use It, and Pitfalls)Verified with runnable code
- Programming > Perl > Windows beginnerUsing Perl Scripts on Windows (Install, Run, Automate, and Avoid Common Pitfalls)Verified with runnable code
- Linux Administration intermediateHow to Update Perl in Linux (Safely): Package Managers, perlbrew, and Source BuildsVerified with runnable code
- debugging intermediateHow to validate function arguments in Perl?Verified with runnable code
- debugging beginnerHow to pretty print JSON data in Perl?Verified with runnable code
- debugging beginnerHow to handle 'Can't locate module' error in Perl?Verified with runnable code
- debugging advancedHow to profile Perl script performance?Verified with runnable code
- debugging advancedHow to find memory leaks in Perl script?Verified with runnable code
- debugging intermediateHow to log debug messages to file in Perl?Verified with runnable code
- networking intermediateHow to query DNS records in Perl?Verified with runnable code
- networking intermediateHow to implement HTTP cookie handling in Perl?Verified with runnable code
- networking intermediateHow to send HTML email in Perl?Verified with runnable code
- networking beginnerHow to check if a URL is reachable in Perl?Verified with runnable code
- networking advancedHow to create WebSocket client in Perl?Verified with runnable code
- networking beginnerHow to parse URL and extract components in Perl?Verified with runnable code
- networking intermediateHow to implement timeout for socket connection in Perl?Verified with runnable code
- networking advancedHow to send email with attachments in Perl?Verified with runnable code
- networking intermediateHow to create a REST API client in Perl?Verified with runnable code
- networking intermediateHow to upload file via FTP in Perl?Verified with runnable code
- one-liners intermediateHow to ROT13 encode text using perl -pe?Verified with runnable code
- one-liners intermediateHow to print matching groups from regex with perl -ne?Verified with runnable code
- one-liners intermediateHow to generate random password using perl -e?Verified with runnable code
- one-liners beginnerHow to convert hex to decimal with perl one-liner?Verified with runnable code
- one-liners beginnerHow to trim whitespace from lines using perl -pe?Verified with runnable code
- one-liners intermediateHow to shuffle lines randomly with perl one-liner?Verified with runnable code
- one-liners intermediateHow to print every Nth line with perl one-liner?Verified with runnable code
- one-liners beginnerHow to count occurrences of a pattern using perl -ne?Verified with runnable code
- one-liners intermediateHow to print lines between two patterns using perl -ne?Verified with runnable code
- one-liners beginnerHow to convert CSV to TSV using perl -pe?Verified with runnable code
- one-liners beginnerHow to reverse lines in a file using perl -e?Verified with runnable code
- one-liners intermediateHow to print unique lines with perl one-liner?Verified with runnable code
- one-liners beginnerHow to replace spaces with underscores using perl -pe?Verified with runnable code
- one-liners intermediateHow to extract IP addresses from log with perl one-liner?Verified with runnable code
- one-liners beginnerHow to number lines in a file using perl -ne?Verified with runnable code
- text-processing beginnerHow to perform case-insensitive search and replace in Perl?Verified with runnable code
- text-processing intermediateHow to sort a file numerically by column in Perl?Verified with runnable code
- text-processing beginnerHow to remove HTML tags from text in Perl?Verified with runnable code
- text-processing intermediateHow to parse Apache log format in Perl?Verified with runnable code
- text-processing intermediateHow to generate CSV from array of hashes in Perl?Verified with runnable code
- text-processing beginnerHow to capitalize first letter of each word in Perl?Verified with runnable code
- text-processing beginnerHow to extract numbers from mixed text in Perl?Verified with runnable code
- text-processing intermediateHow to convert Markdown to HTML in Perl?Verified with runnable code
- text-processing intermediateHow to parse fixed-width column data in Perl?Verified with runnable code
- text-processing intermediateHow to read last N lines of a file in Perl?Verified with runnable code
- text-processing intermediateHow to replace multiple patterns in one pass in Perl?Verified with runnable code
- text-processing intermediateHow to validate email format using Perl regex?Verified with runnable code
- text-processing intermediateHow to parse XML and extract node values in Perl?Verified with runnable code
- text-processing intermediateHow to find lines matching a pattern across multiple files in Perl?Verified with runnable code
- text-processing beginnerHow to convert Windows line endings to Unix in Perl?Verified with runnable code
- text-processing intermediateHow to parse JSON file and extract specific fields in Perl?Verified with runnable code
- text-processing intermediateHow to generate a report from log file data in Perl?Verified with runnable code
- system-admin intermediateHow to check disk space and send email alert in Perl?Verified with runnable code
- system-admin intermediateHow to schedule periodic tasks without cron in Perl?Verified with runnable code
- system-admin intermediateHow to find and replace text in log files using Perl?Verified with runnable code
- system-admin beginnerHow to read system load average in Perl?Verified with runnable code
- system-admin advancedHow to monitor network interface traffic in Perl?Verified with runnable code
- system-admin beginnerHow to backup files with timestamp in Perl?Verified with runnable code
- system-admin beginnerHow to get list of running processes in Perl?Verified with runnable code
- system-admin intermediateHow to delete files older than 30 days in Perl?Verified with runnable code
- system-admin intermediateHow to tail -f a log file in Perl script?Verified with runnable code
- system-admin intermediateHow to check if a port is open on localhost in Perl?Verified with runnable code
- system-admin intermediateHow to send system metrics to a log file in Perl?Verified with runnable code
- system-admin intermediateHow to compress old log files with gzip in Perl?Verified with runnable code
- system-admin advancedHow to run a Perl script as daemon in background?Verified with runnable code
- cpan beginnerHow to use File::Slurp to read entire file into variable in Perl?Verified with runnable code
- cpan intermediateHow to get file modification time with Path::Tiny in Perl?Verified with runnable code
- cpan beginnerHow to use Path::Tiny touch to create empty file in Perl?Verified with runnable code
- cpan intermediateHow to use List::Util reduce for custom aggregation in Perl?Verified with runnable code
- cpan intermediateHow to compare two DateTime objects in Perl?Verified with runnable code
- cpan intermediateHow to use DateTime::Duration for time periods in Perl?Verified with runnable code
- cpan beginnerHow to decode Base64 string in Perl using MIME::Base64?Verified with runnable code
- cpan beginnerHow to encode string to Base64 with MIME::Base64 in Perl?Verified with runnable code
- cpan beginnerHow to use Getopt::Long with boolean flags in Perl?Verified with runnable code
- cpan intermediateHow to parse command line options with Getopt::Long in Perl?Verified with runnable code
- cpan beginnerHow to move file with File::Copy in Perl?Verified with runnable code
- cpan beginnerHow to copy file using File::Copy in Perl?Verified with runnable code
- cpan beginnerHow to create temporary directory with File::Temp in Perl?Verified with runnable code
- cpan beginnerHow to use File::Temp to create temporary file in Perl?Verified with runnable code
- cpan beginnerHow to use List::MoreUtils uniq to remove duplicates in Perl?Verified with runnable code
- serialization advancedHow to validate JSON schema in Perl?Verified with runnable code
- serialization intermediateHow to use JSON::MaybeXS for automatic backend selection in Perl?Verified with runnable code
- serialization intermediateHow to handle JSON parsing errors in Perl?Verified with runnable code
- serialization beginnerHow to convert Perl hash to YAML string?Verified with runnable code
- serialization beginnerHow to load YAML configuration file in Perl script?Verified with runnable code
- serialization intermediateHow to escape special characters when encoding JSON in Perl?Verified with runnable code
- serialization intermediateHow to use Cpanel::JSON::XS for JSON processing in Perl?Verified with runnable code
- serialization intermediateHow to handle JSON boolean values true and false in Perl?Verified with runnable code
- serialization intermediateHow to read multi-document YAML file in Perl?Verified with runnable code
- serialization advancedHow to serialize Perl objects to JSON with custom encoding?Verified with runnable code
- serialization beginnerHow to handle JSON arrays in Perl?Verified with runnable code
- http intermediateHow to handle gzip compressed responses with LWP in Perl?Verified with runnable code
- http beginnerHow to use LWP::Simple for quick GET requests in Perl?Verified with runnable code
- http intermediateHow to parse HTML response with HTML::TreeBuilder in Perl?Verified with runnable code
- http intermediateHow to use Mojo::UserAgent for HTTP requests in Perl?Verified with runnable code
- http advancedHow to set connection keep-alive with LWP::UserAgent in Perl?Verified with runnable code
- http intermediateHow to use LWP::Protocol::https for HTTPS requests in Perl?Verified with runnable code
- http intermediateHow to handle HTTP errors and exceptions with LWP in Perl?Verified with runnable code
- http advancedHow to make asynchronous HTTP requests in Perl?Verified with runnable code
- http beginnerHow to use LWP::UserAgent with custom User-Agent string?Verified with runnable code
- http intermediateHow to enable SSL verification in Perl LWP::UserAgent?Verified with runnable code
- http beginnerHow to parse response content from LWP::UserAgent in Perl?Verified with runnable code
- http intermediateHow to use HTTP::Request to build complex requests in Perl?Verified with runnable code
- http intermediateHow to handle redirects with LWP::UserAgent in Perl?Verified with runnable code
- http intermediateHow to send JSON data in POST request with LWP::UserAgent?Verified with runnable code
- http beginnerHow to set timeout for HTTP requests in Perl LWP::UserAgent?Verified with runnable code
- http beginnerHow to download a file with LWP::UserAgent in Perl?Verified with runnable code
- http intermediateHow to use a proxy with LWP::UserAgent in Perl?Verified with runnable code
- http intermediateHow to handle cookies with LWP::UserAgent in Perl?Verified with runnable code
- oop advancedHow to use Moose::Util::TypeConstraints for custom types?Verified with runnable code
- oop intermediateHow to implement method delegation in Perl Moo?Verified with runnable code
- oop intermediateHow to use Type::Tiny with Moo for strict typing in Perl?Verified with runnable code
- oop beginnerHow to use required attributes in Perl Moo and Moose?Verified with runnable code
- oop intermediateHow to convert a Perl Moo class to Moose?Verified with runnable code
- oop intermediateHow to use Moo lazy_build for attribute defaults in Perl?Verified with runnable code
- oop advancedHow to implement multiple inheritance with Moose in Perl?Verified with runnable code
- oop intermediateHow to use MooseX::StrictConstructor to catch typos in Perl?Verified with runnable code
- oop advancedHow to create a Moose singleton class in Perl?Verified with runnable code
- oop intermediateHow to use delegation with handles in Perl Moose?Verified with runnable code
- oop advancedHow to define custom type constraints in Perl Moose?Verified with runnable code
- oop advancedHow to use Moose method modifiers before, after, and around?Verified with runnable code
- oop intermediateHow to make a Moose class immutable for performance in Perl?Verified with runnable code
- oop intermediateHow to use Moose attribute triggers in Perl?Verified with runnable code
- oop intermediateHow to create a role in Perl Moose and consume it?Verified with runnable code
- oop intermediateHow to use Moose type constraints with Int, Str, and ArrayRef?Verified with runnable code
- oop beginnerHow to define a Moose class with attributes in Perl?Verified with runnable code
- oop intermediateHow to use coercion with Moo attributes in Perl?Verified with runnable code
- oop advancedHow to add a method modifier with around in Perl Moo?Verified with runnable code
- oop beginnerHow to implement class inheritance with Perl Moo extends?Verified with runnable code
- dbi intermediateHow to fetch data as hash of hashes in Perl DBI?Verified with runnable code
- dbi intermediateHow to use Perl DBI with DBD::ODBC for SQL Server?Verified with runnable code
- dbi advancedHow to handle database connection pooling in Perl DBI?Verified with runnable code
- dbi intermediateHow to use Perl DBI selectall_arrayref for fetching all data?Verified with runnable code
- dbi intermediateHow to get column names from a Perl DBI statement handle?Verified with runnable code
- dbi beginnerHow to execute DELETE queries with WHERE clause in Perl DBI?Verified with runnable code
- dbi beginnerHow to enable RaiseError and PrintError in Perl DBI connection?Verified with runnable code
- dbi beginnerHow to use Perl DBI quote method to escape SQL strings?Verified with runnable code
- dbi beginnerHow to fetch a single row as array in Perl DBI?Verified with runnable code
- dbi intermediateHow to set AutoCommit to false for transactions in Perl DBI?Verified with runnable code
- dbi intermediateHow to handle NULL values in Perl DBI queries?Verified with runnable code
- dbi beginnerHow to connect to SQLite database using Perl DBI?Verified with runnable code
- dbi beginnerHow to execute UPDATE queries with Perl DBI?Verified with runnable code
- dbi intermediateHow to get the last inserted ID after INSERT in Perl DBI?Verified with runnable code
- dbi intermediateHow to use bind parameters in Perl DBI INSERT statements?Verified with runnable code
- dbi beginnerHow to connect to PostgreSQL database using Perl DBI?Verified with runnable code
- dbi beginnerHow to fetch data row by row using Perl DBI fetchrow_hashref?Verified with runnable code
- dbi intermediateHow to insert multiple rows efficiently using Perl DBI?Verified with runnable code
- file-io advancedHow to use File::Find to recursively search directories in Perl?Verified with runnable code
- file-io intermediateHow to use Path::Tiny for file operations in Perl?Verified with runnable code
- file-io intermediateHow to use File::Copy to copy files in Perl?Verified with runnable code
- file-io intermediateHow to get file modification time in Perl?Verified with runnable code
- file-io intermediateHow to use File::Slurp to read files in Perl?Verified with runnable code
- file-io intermediateHow to open a file with specific encoding in Perl?Verified with runnable code
- file-io beginnerHow to change the current directory in Perl?Verified with runnable code
- file-io beginnerHow to get the current working directory in Perl?Verified with runnable code
- file-io intermediateHow to use glob to get files matching a pattern in Perl?Verified with runnable code
- file-io intermediateHow to read directory contents in Perl?Verified with runnable code
- file-io beginnerHow to remove a directory in Perl?Verified with runnable code
- file-io beginnerHow to create a directory in Perl?Verified with runnable code
- file-io intermediateHow to copy a file in Perl?Verified with runnable code
- file-io beginnerHow to rename a file in Perl?Verified with runnable code
- file-io beginnerHow to delete a file in Perl?Verified with runnable code
- file-io beginnerHow to check if a path is a directory in Perl?Verified with runnable code
- file-io beginnerHow to get the file size in Perl?Verified with runnable code
- file-io beginnerHow to check if a file is writable in Perl?Verified with runnable code
- file-io beginnerHow to check if a file is readable in Perl?Verified with runnable code
- file-io beginnerHow to check if a file exists in Perl?Verified with runnable code
- subroutines beginnerHow to use the return statement early in a Perl subroutine?Verified with runnable code
- subroutines advancedHow to create higher-order functions in Perl?Verified with runnable code
- subroutines intermediateHow to use shift to get subroutine arguments in Perl?Verified with runnable code
- subroutines advancedHow to use caller() to get subroutine call information in Perl?Verified with runnable code
- subroutines intermediateHow to call a subroutine as a method in Perl?Verified with runnable code
- subroutines intermediateHow to use state variables in Perl subroutines?Verified with runnable code
- subroutines intermediateHow to check the number of arguments passed to a subroutine in Perl?Verified with runnable code
- subroutines advancedHow to use goto &subroutine for tail call optimization in Perl?Verified with runnable code
- subroutines advancedHow to create recursive subroutines in Perl?Verified with runnable code
- subroutines intermediateHow to use subroutine signatures in modern Perl?Verified with runnable code
- subroutines advancedHow to use prototypes in Perl subroutines?Verified with runnable code
- subroutines intermediateHow to pass hashes to subroutines in Perl?Verified with runnable code
- subroutines intermediateHow to pass arrays to subroutines without flattening in Perl?Verified with runnable code
- subroutines intermediateHow to create anonymous subroutines in Perl?Verified with runnable code
- subroutines advancedHow to use wantarray to detect context in Perl subroutines?Verified with runnable code
- subroutines advancedHow to create a closure in Perl?Verified with runnable code
- subroutines intermediateHow to set default values for subroutine parameters in Perl?Verified with runnable code
- subroutines intermediateHow to use named parameters in Perl subroutines?Verified with runnable code