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Simple Perl / CGI script to calculate BMI
The Common Gateway Interface example from a Well House Consultants training course
More on The Common Gateway Interface [link]
Source code: slip Module: P403
#!/usr/bin/env perl
# ($height, $weight) = ($ENV{QUERY_STRING} =~ /h=(.*)&w=(.*)/ ); # Previous line worked for specific form / numeric inputs # Handle inputs via the default GET method @parts = split(/\&/,$ENV{QUERY_STRING}); foreach $p (@parts) { ($n,$v) = split(/=/,$p); $v =~ tr/+/ /; $v =~ s/%(..)/pack("C",hex($1))/eg; $tabl{$n} = $v; } # Subroutine to clean up inputs so they can be echoed sub webify { $_ = $_[0]; s/&/&/g; s/</</g; return $_; } $height = $tabl{h}; $weight = $tabl{w}; $ech_h = webify($height); $ech_w = webify($weight); # represents the work ... # ----------------------- $status = `uptime`; $discs = `df -k`; if ($height > 0) { $bmi = $weight / ($height * $height); } else { $bmi = '[result space]'; } # Send output - MANDATORY Header, MANDATORY blank line, content print "Content-type: text/html\n\n"; print <<"STUFF" <html> <head><title>BMI demo</title></head> <body><h1>Perl Course Demo</h1> Input height = $ech_h and weight = $ech_w<br><br> About the system ... $status<br><br> Disc usage ... <br> <pre>$discs</pre><br><br> The BMI is $bmi<br><br> <form> Height <input name=h><br> Weight <input name=w><br> <input type=submit></form> <hr> Copyright .... </body></html> STUFF ; __END__ Sample output: <html> <head><title>BMI demo</title></head> <body><h1>Perl Course Demo</h1> Input height = 1.77 and weight = 65<br><br> About the system ... 13:41:30 up 66 days, 7:23, 0 users, load average: 0.09, 0.21, 0.27 <br><br> Disc usage ... <br> <pre>Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda3 73520780 47961544 21764284 69% / /dev/sda1 194442 11683 172720 7% /boot tmpfs 452264 0 452264 0% /dev/shm </pre><br><br> The BMI is 20.7475501931118<br><br> <form> Height <input name=h><br> Weight <input name=w><br> <input type=submit></form> <hr> Copyright .... </body></html> Learn about this subject
This module and example are covered on the following public courses:
* Deploying LAMP - Linux, Apache, MySQL, Perl/PHP * Linux Web Server * Using Perl on the Web Also available on on site courses for larger groups Books covering this topic
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