FreeKB - Perl articles

FreeKB - Perl articles

Perl articles

ArraysGetting Started with Arrays Append value to the beginning of an array (unshift)Append value to the end of an array (push)Count values in an array Create array over SSH Remove all values from array (undef)Remove empty lines from array Remove first line from array (splice)Remove values beginning of array (shift)Remove values end of array (pop) Remove values from array (splice)Replace values in array (map)Sort array Store files directories in array (glob)Built in Perl commands%ENV environment special hash Escape special characters using quotemeta (\Q \E)eval function Lower case (lc)Random number generator (rand)Update the first character in a string to be upper case (ucfirst)Upper case (uc)Variable contains (=~) or does not contain (!~)Wrap text (Text::Wrap)Command Line Options and FlagsGetting Started with command line options and flagsCountCount characters in a string (length)Count lines in a file ($.)Data::DumperGetting Started with Data::DumperDate TimeDate and time using strftime Date and time using Time::PieceDirectoriesList directoriesFile::BasenameFile::Basename moduleFile::TouchGetting Started with File::TouchFilesPrevious, current, and next line in a file (seek, tell)Transfer a fileFiles - TXT / DOC / CSVDetermine if file contains a string of data Read a file (<)Read and write to the same file Replace values in a file Write to a file (> and >>)Files - XLSAppend or replace data in an Excel spreadsheet (Spreadsheet::ParseExcel)Read an Excel 95-2003 spreadsheet (xls) Write to an Excel 95-2003 spreadsheet (xls) HashesArray of Hashes Count keys and values in a hash Hash (append values)Hash (create empty hash)Hash (determine if hash is defined)Hash (determine if hash key is defined)Hash (grep keys)Hash (lock_keys lock_values)Hash (multidimensional hash)Hash (remove values)Hash (sort keys)Hash Array (append key value pairs) Hash Array (append keys)Hash Array (append values)Hash Array (create empty array)Hash Array (determine if hash array defined)Hash Array (remove values)loop through hash keys loop through hash values print hash valuesif elsif else statementsGetting Started with if elsif else statements Determine if a directory is emptyInstallInstall a module (cpan)Install Perl on LinuxJSONGetting Started with JSON::Parse JSON Modification of a read-only value JSON::Parse reason Not Found error Object Not FoundLoggerGetting Started with Log::Log4perl LoggerLoopsforeach loops Loop through a file until line match loop through a range of items in an array Moving onto next value in a loop (next)while loopMathAddition (+)Convert hexadecimal to decimal Division (/)Multiplication (*)Subtraction (-)Sum of integers in a fileModulesCreate your own module Determine if a module is installedOtherNative operating system command (`backticks`)Prompt a user for input Scientific notation with Microsoft ExcelPrinting outputBold text (Term::ANSIColor)Display text on the console (print and say)Regular Expressions (regex)( and ) characters Append leading zeros to numbers carriage returns (\r ^M)Dealing with Microsoft Word curly fancy smart quotes Do something end of line Do something every nth line in a file Do something range of lines Flatten lists (merge similar lines)Match last occurrence of a line in a file new lines (\n)Regular expression delimiter Replace text in a file (-pi -e =~)Trailing forward slash Using grep whitespace (\s)SFTPGetting Started with Net::SFTPSpliting stringCut a string into pieces (substr)Split fields at delimiterSQL databaseConnect to a SQL databaseSSHGetting Started with Net::OpenSSH Getting Started with Net::SSH:Perl Local and remote variables over SSH SSH run command on a remote hostSubroutinesGetting Started with Subroutines Identical subroutine names (package, namespace)Pass values to a subroutine (@_ and $_ and shift)return in a subroutineTroubleshootingResolve "Host key for has changed"Variables / ScalarsGetting Started with scalars and variables Append values to a variable (.=)Determine if a variable is defined Determine if a variable is empty or null Global and lexical variables (my)Replace values in a variable (=~)XML::SimpleGetting Started with XML::Simple Data::Dumper and XML::Simple XML::Simple Arrays XML::Simple ForceArray XML::Simple Ignore Attributes XML::Simple looping through hash keys XML::Simple looping through keys XML::Simple looping through keys that contain attributes XML::Simple Printing Attributes XML::Simple printing keys (XMLin)XML::Simple printing values (XMLin)