Perl Programs and
Hello World

A Perl program consists of a sequence of declarations and statements.

Here is a series of different style examples of "hello world" programs.


#!/usr/bin/perl use struct; use warnings; # same as: perl -w print "Hello World!\n";
perl -e 'print "Hello World!\n";'
perl hello.pl
# where file "hello.pl" contains: print "Hello World!\n";
On old unix systems that do not support the magic #! line, or if the path length to the perl interpreter is longer than 32 chacatacters, try this:
#!/bin/sh -- # perl, to stop looping
eval 'exec /usr/bin/perl -S ${1+"$@"}'    if 0;