Table of Contents

!, Boolean expressions (logical operators)

!~, Introduction to Regexes

#, Comments

$!, Opening a file - error handling

$#array, Array index (menu)

$/, slurp mode

$0, Command line parameters

$a, Advanced sort

$array[-1], Array index (menu)

$array[0], Array index (menu)

$b, Advanced sort

$ENV{HOME}, UNIX commands from the inside

$_, $_

%, What is a hash?

%ENV, UNIX commands from the inside

&&, Boolean expressions (logical operators)

<>, Diamond operator

<STDIN>, User Input

(), List Literals, list ranges

-d, File test or -X operators

-e, File test or -X operators

options, Environment

-f, File test or -X operators

-M, File test or -X operators

-v

options, Environment

., String Operators

.., List Literals, list ranges

//, Introduction to Regexes

==, Fixing the problem: Conditional statements: if

=head1, POD - Plain Old Documentation

=head2, POD - Plain Old Documentation

=~, Introduction to Regexes

? :, Ternary operator

@, Create an Array, loop over with foreach

@ARGV, Command line parameters

\

reference, Process command line parameters, use modules

``, Running External Programs

||, Boolean expressions (logical operators)

and, Boolean expressions (logical operators)

associative array, What is a hash?

basename, More UNIX commands implemented in modules

catfile, More modules

cd, UNIX commands from the inside

CGI, Generate web page

chdir, UNIX commands from the inside

chmod, UNIX commands from the inside

chomp, chomp

chown, UNIX commands from the inside

copy, More UNIX commands implemented in modules

cp, More UNIX commands implemented in modules

csv, process csv file, Process multi field csv file

cwd, More UNIX commands implemented in modules

Data::Dumper, Dumping hashes

database, Database access using DBI and DBD::SQLite

DBD, Database access using DBI and DBD::SQLite

DBI, Database access using DBI and DBD::SQLite

defined, TRUE and FALSE

del, UNIX commands from the inside

delete, exists, delete hash element

df, Reporting file system diskspace usage (df)

diagnostics, Safety net

die, die, warn, exit

catching, Error handling with eval

dirname, More UNIX commands implemented in modules

du, Reporting diskspace usage on the mail server, A du like script

else, Syntax of if statement

elsif, Syntax of if statement

eof, Reading from file, read, eof

eval {};, Error handling with eval

Excel, Read Excel file

exists, exists, delete hash element

exit, die, warn, exit

File::Find, Change Copyright text in every source file in a directory hierarchy

File::Slurp, File::Slurp

File::Spec, More modules

File::Tools, File::Tools

find, Change Copyright text in every source file in a directory hierarchy

foreach, loop over elements of list with foreach

functions, Subroutines

GET, Fetch web page

Getopt::Long, Process command line parameters, use modules

glob, UNIX commands from the inside

gmtime, The year 19100

hash, What is a hash?

HTML::Template, Generate web page

http, Fetch web page

if, Fixing the problem: Conditional statements: if

index, String functions

join, Join

keys, Fetching data from hash

lc, String functions

LDAP, Net::LDAP

length, String functions

link, UNIX commands from the inside

LIST context, SCALAR and LIST Context

ln, UNIX commands from the inside

localtime, The year 19100

ls, Rename files

lstat, stat, lstat

LWP::Simple, Fetch web page

mail, Send e-mail

Mail::Sendmail, Send e-mail

move, More UNIX commands implemented in modules

mv, More UNIX commands implemented in modules

my, Scalar variables (use my)

Net::LDAP, Net::LDAP

not, Boolean expressions (logical operators)

open, Opening file for reading

opendir, Directory handles

or, Boolean expressions (logical operators)

perldoc, Perl documentation

POD, POD - Plain Old Documentation

pop, pop, push

push, pop, push

pwd, More UNIX commands implemented in modules

q, Strings - Single quoted

qq, Strings - Double quoted

queue, queue (shift, push)

qw, List Literals, list ranges

qx, Running External Programs

read, Reading from file, read, eof

readdir, Directory handles

readlink, UNIX commands from the inside

recoursive, Recoursive subroutines

rename, UNIX commands from the inside

return, Subroutines

list, Return a list

reverse, sort, reverse

rm, UNIX commands from the inside

rmdir, UNIX commands from the inside

SCALAR context, SCALAR and LIST Context

scalar variables, Scalar variables (use my)

scalar(), Context Sensitivity

scope, Scope of variables

seek, tell, seek

sendmail, Send e-mail

shift, shift, unshift

short circuit, Your Salary is in Danger - Short-Circuit

slurp, slurp mode, File::Slurp

sort, sort, reverse

sort keys, Fetching data from hash

split, process csv file

SQLite, Database access using DBI and DBD::SQLite

stack, stack (pop, push)

stat, stat, lstat

strict, Safety net

sub, Subroutines

subroutines, Subroutines

substr, String functions

symlink, UNIX commands from the inside

system, Running External Programs

tell, tell, seek

Text::CSV_XS, process csv file using Text::CSV_XS

Tie::File, Tie::File

time, The year 19100

tree, Exercise: Tree

truncate, truncate

uc, String functions

undef, TRUE and FALSE

unlink, UNIX commands from the inside

unshift, shift, unshift

use, Process command line parameters, use modules

warn, die, warn, exit

warnings, Safety net

web, Fetch web page

while, Process an entire file line by line (while, cat)

x, String Operators

XML, Parse XML file

XML::Simple, Parse XML file