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Perl module P305
User Input
Exercises, examples and other material relating to training module P305. This module is presented on Private Courses and Specially Run Courses only

Reading data from STDIN and from files is plenty for many applications, but sometimes you'll need to read from the screen without echoing, process input even if the return key is not pressed, or check the keyboard to see if there's input available without pausing your program while the user responds.

Articles and tips on this subjectupdated
2876Different perl examples - some corners I rarely explore
The private Perl course that I ran on Wednesday through Friday of last week was a little out of the ordinary as we were concentrating far more that usual on a wide variety of practices that may be found - either in legacy code or advanced recent code. Great fun for me, and plenty of new examples. Here ...
2382Giving up on user input - keyboard timeout in Perl
There's an old piece of code that I've used to demontstrate how (in Perl) you can prompt for a user input ... but then time out the input on an alarm signal if the user doesn't enter data within a certain time. The code's [here] if you want to have a look. But let me warn you ... it's one of those ...
2213Keyboard reading in Perl - character by character not line by line
If I'm typing in my age in response to a prompt and I start with a "6" character, will you assume that I'm between 60 and 69 years old? You might ... but then I may backspace (having accidentally struck the "6" key and start with a slightly lower digit. But in my program, I do NOT want to have to write ...
Examples from our training material
ask   Send a signal to program h1
askpw   Using ioctls and POSIX to provide a password entry system
fc2   Reacting to each keystroke rather than awaiting a new line
fi2   Reporting maximum field per line count
file_in   Unpacking characters
h1   Long running program with interaction
kb2   Giving the user a limited time to make an entry
kbcheck   select to check input availability
kbtest   If the user has started typing, wait for a whole line. Otherwise carry on
keyin   print out ASCII decimal equivalents of entries
pcr   Binary file copy
Background information
Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from [here].
Topics covered in this module
Review of reading from keyboard and file.
Checking to see if input is pending.
Using Fcntl via POSIX.
Turning echo off - password entry.
Reading from the keyboard without waiting for a new line.
More flexibility reading from a file.
Perl modules to give more input flexibility.
Complete learning
If you are looking for a complete course and not just a information on a single subject, visit our Listing and schedule page.

Well House Consultants specialise in training courses in Ruby, Lua, Python, Perl, PHP, and MySQL. We run Private Courses throughout the UK (and beyond for longer courses), and Public Courses at our training centre in Melksham, Wiltshire, England. It's surprisingly cost effective to come on our public courses - even if you live in a different country or continent to us.

We have a technical library of over 700 books on the subjects on which we teach. These books are available for reference at our training centre.

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