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Global Special Variable Types in Perl
There are various global special variables in Perl. We have listed them in different blocks based on their usage and nature −
Global Array Special Variables
| @ARGV | The array containing the command-line arguments intended for the script. |
| @INC | The array containing the list of places to look for Perl scripts to be evaluated by the do, require, or use constructs. |
| @F | The array into which the input lines are split when the -a command-line switch is given. |
Global Hash Special Variables
| %INC | The hash containing entries for the filename of each file that has been included via do or require. |
| %ENV | The hash containing your current environment. |
| %SIG | The hash used to set signal handlers for various signals. |
Global Special Filehandles
| ARGV | The special filehandle that iterates over command line filenames in @ARGV. Usually written as the null filehandle in <>. |
| STDERR | The special filehandle for standard error in any package. |
| STDIN | The special filehandle for standard input in any package. |
| STDOUT | The special filehandle for standard output in any package. |
| DATA | The special filehandle that refers to anything following the __END__ token in the file containing the script. Or, the special filehandle for anything following the __DATA__ token in a required file, as long as you're reading data in the same package __DATA__ was found in. |
| _ (underscore) | The special filehandle used to cache the information from the last stat, lstat, or file test operator. |
Global Special Constants
| __END__ | Indicates the logical end of your program. Any following text is ignored, but may be read via the DATA filehandle. |
| __FILE__ | Represents the filename at the point in your program where it's used. Not interpolated into strings. |
| __LINE__ | Represents the current line number. Not interpolated into strings. |
| __PACKAGE__ | Represents the current package name at compile time, or undefined if there is no current package. Not interpolated into strings. |
Updated on: 29-Nov-2019
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