Perl - File Handling

Perl module P207

File Handling

Exercises, examples and other material relating to training module P207. This topic is presented on public courses Perl Programming, Perl bootcamp

STDIN, STDOUT, STDERR and DATA - Perl file handles

A Typical computer program is run from a single keyboard or other control point, but with access to thousands of files. So it's "cheap" for a programming ...

http://www.wellho.net/mouth/255_STDI ... ndles.html [short article]

Learning to program in Perl / Perl Programming - training course - Programming Perl - for newcomers to the language

Learning to program in Perl / Perl Programming - Programming Perl - for newcomers to the language This course introduces you to the Perl programming language. ...

http://www.wellho.net/course/ppfull.html [course]

Learning to Program in Perl / Perl Programming - training course - Learning Perl - whether you're new to programming or 'converting'.

Learning to Program in Perl / Perl Programming - Learning Perl - whether you're new to programming or 'converting'. This course covers programming in the ...

http://www.wellho.net/course/lpfull.html [course]

Custom course - training course - Custom course

Custom course - Custom course Custom course This is a custom course that will be tailored to your trainee's needs and based on their current knowledge ...

http://www.wellho.net/course/ccfull.html [course]

Perl Bootcamp - training course - The fundamentals of the language.

Perl Bootcamp - The fundamentals of the language. This course covers the fundamentals of the Perl programming for computer professionals who are new to ...

http://www.wellho.net/course/bpfull.html [course]

Reading a file multiple times - file pointers

When you open a file for read, you create a "file pointer" which knows where in the file you are, and each time you read from the file this advances so ...

http://www.wellho.net/mouth/1442_Rea ... nters.html [short article]

Writing to and reading from files

1. You open the file using the open function. This returns a file handle through which you access the data; a file handle comprise a buffer within your ...

http://www.wellho.net/solutions/perl-wri ... files.html [longer article]

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
bridges	sample answer - town with Bridges in name
christmas	Formatted printing - splittin money between the grandchildren
ck	Splitting money many ways - formatted printing
ddd	Splitting and reformatting data
fan	One input and five output files in a single program
fprint	Formatted printing - some specifier details
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
paut	Piping a ping into your program
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
wacsal	Re-active formatting

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.

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