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English and short names for informational special variables
Topicalization and Special Variables example from a Well House Consultants training course
More on Topicalization and Special Variables [link]
Source code: infovars Module: P210
use English;

print "$PROGRAM_NAME reports on special variables\n\n";

print "About the Perl process:\n";
print ("Process id: $$ $PID $PROCESS_ID\n");
print ("Real User id: $< $UID $REAL_USER_ID\n");
print ("Real Group id: $( $GID $REAL_GROUP_ID\n");

print ("\nAbout the Perl Environment\n");
# The Perl Version in $^V is a 3 character string ...
printf ("Perl Version: %vd %vd\n",$^V,$PERL_VERSION);
print ("Old style: $]\n");
print ("Operating Sys: $^O $OSNAME\n");
print ("Executable Name $^X $EXECUTABLE_NAME\n");
print ("Script Started: $^T $BASETIME\n");
Learn about this subject
This module and example are covered on the following public courses:
 * Perl Programming
 * Perl bootcamp
Also available on on site courses for larger groups

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Other Examples
This example comes from our "Topicalization and Special Variables" training module. You'll find a description of the topic and some other closely related examples on the "Topicalization and Special Variables" module index page.

Full description of the source code
The complete training module that describes this source code is availble for download (for limited use) from our download centre.

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