Perl Lab #11 Intro to Perl Debbie Bartlett

Perl Lab #1 2 Perl Practical Extraction and Report Language –or- Pathologically Eclectic Rubbish Lister Created by Larry Wall in 1987  Originally developed when he found limitations in the tools he was using for report generation  Borrowed features from other languages such as C, shell scripting, AWK, sed, and Lisp Interpreted language Why use Perl?  Extract information from a text file and print out a report  Convert a text file into another form  Lots of other tasks!

Perl Lab #1 3 Perl Scripts Creating a Perl Script  Use a text editor such as gedit or emacs  Type in your program  Name the file filename.pl  Set execution permission bit, i.e. chmod 755 filename.pl Type the command name, filename.pl, at your terminal window shell prompt

Perl Lab #1 4 Sample Perl Script #! /usr/bin/perl print “What is your name?”; $name = ; chomp ($name); if ($name eq “Debbie”) { print (“Hello, Debbie! I am glad that you are in CS192 today!\n”); } else { print (“Hello, $name!\n”); # ordinary greeting }

Perl Lab #1 5 Perl1 Lab Assignment Type in your version of the Perl script (slide #4)‏ Ask a second question in your Perl script What happens if you leave out the chomp statement?  Take it out, try it, and then put it back What happens if you leave off the “;” after “What is your name? “  Take if off, try it, and then put it back What happens if you leave off the quote after “What is your name? – Take if off, try it, and then put it back Look in Google for “while” loop. Add a while loop to your Perl script?  Show your script to a lab instructor or helper