while

while

• The while loop also performs iteration and in CGI scripts is primarily for reading lines in a file. The while loop can be used to read and print out every line of a file with the following syntax:

  open ([FILE_HANDLE_NAME], "[filename]");
       while (<[FILE_HANDLE_NAME]>)
         {
         print "$_";
         }
       close ([FILE_HANDLE_NAME]);
  

• The script would print out every line in the file "filename" because the "$_", the Perl "default" variable, represents "the current line" in this case.

Additional Resources:

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