Perl - File Handling

File Handling - Perl module P207

Opening data files, reading from them, and writing to them. Checking whether files exist. And if so, how big are they? Using the file handling elements of Perl to handle keyboard, screen, other processes, and connections to other computers.

This topic is presented on public courses Perl Programming, Perl bootcamp

Examples from our training material

addplus	Formatter - adding a leading plus
christmas	Formatted printing - splittin money between the grandchildren
ddd	Splitting and reformatting data
fan	One input and five output files in a single program
fsv	File open, read, write test example
leedspark	alternative answer to practical at end of module
legacy	Divide money between children and print neatly
output.txt	Sample output "park" program
park	Sample answer to "the park" exercise
perlwget	Running an OS command from within a Perl script
piper	Use of file handles to pipe from and to processes
procmon	Process monitoring - demonstration of principle
reporter	file status operators -x and -s
sp	Formatted printing

Opentalk forum discussions related to this topic

reading a text file and extracting info
Writting a script to break a file
updating a file
reading rc files
perl basic
Variable formatting beyond printf

Pictures

"Now where was that data file??"
"Now where did I save that data file?"

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 http://www.training-notes.co.uk.

Topics covered in this module

File input and output.
File Handles.
The open function.
Reading from a file handle.
Writing to a file handle.
Closing a file.
Other things you can handle through the file interface.
File testing.
Formatted printing.
Floating point formats.
Formats for whole numbers (integers).
Formats for variable text strings.
Constant text.
sprintf.
Summary.

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 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 600 books on the subjects on which we teach. These books are available for reference at our training centre. Also available is the Opentalk Forum for discussion of technical questions.