Perl
Overview
Introduction
Why yet
another utility?
Beginning
Perl
Invoking Perl
Documentation on
perl
Perl Scripts
Variables
Input
and output
Files and
redirection
Pipes
The DATA
filehandle
Fields
Control structures
Predefined Perl
Functions
Modules
Regular expressions
Single
character translation
String
editing
Perl and the Kernel
Quality
code
When do I use Perl?
Summary
Exercises
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Functions
There are many functions predefined in Perl, too many
to list here. Some are almost identical to standard utilities
available on UNIX/Linux, such as chmod,
mkdir, grep and sort. We
present here a brief (and simplified) description of a set of
standard Perl functions that we feel are particularly useful. For a
full list, and a detailed explanation of each, you should consult
the Perl web site at www.perl.com.
chdir |
changes the working directory to its (string) argument |
do |
executes as a Perl program the file that is its (string)
argument |
eof |
returns true if its (filehandle) argument is at end of
file |
eval |
evaluates its argument as if it were a Perl program |
exec |
executes the shell command that is its (string) argument |
exit |
ends program immediately, exit status its argument |
lc |
returns its (string) argument changed to lowercase |
length |
returns the number of characters in its (string) argument |
scalar |
returns the number of elements in its (array) argument |
uc |
returns its (string) argument changed to uppercase |
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