Here's our list of frequently-asked questions (FAQ's), indexed by category.

Arrays

• How do I print the entire contents of an array?
   
• How do I do <fill-in-the-blank> for each element in an array?

Control Flow

 

Debugging

• Why should I use the -w argument when invoking Perl?

Files & Directories

• How do I read data from files with Perl?
   
• How do I do (fill_in_the_blank) for each file in a directory?
   
• How do I generate a list of all .html files in a directory?
   
• How do I replace every <TAB> character in a file with a comma? (without renaming the file)

Getting Perl

• Where can I get Perl for Windows?
   
• Where can I get the Perl FAQ?

Hashes (Associative Arrays)

• How do I set environment variables in Perl programs?
   
• How do I do <fill-in-the-blank> for each element in a hash?
   
• How do I sort a hash by the hash key?
   
• How do I sort a hash by the hash value?

Miscellaneous

• How do I read command-line arguments?

Networking

• What's the easiest way to download the contents of a URL with Perl?

Strings

• How do I concatenate (merge) strings with Perl?

System Interaction

• How do I send e-mail from a Perl/CGI program on a Unix computer system?
   
• How do I read data from a pipeline?
   
• How do I set environment variables in Perl programs?