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)Store files directories in array (glob)Built in Perl commandsEscape special characters using quotemeta (\Q \E)Lower case (lc)Random number generator (rand)Update the first character in a string to be upper case (ucfirst)Upper case (uc)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 directoriesFilesPrevious, current, and next line in a file (seek, tell)Transfer a fileFiles - JSONGetting Started with JSON::ParseFiles - 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) HashesGetting Started with Hashes Array of Hashes Determine if hash array defined Determine if hash defined Hash with multiple Arrays (multidimensional)Hash with one Array Loop through hash values Loop through keys Multidimensional Hashif elsif else statementsGetting Started with if elsif else statementsInstallInstall a module (cpan)Install Perl on LinuxLoggerGetting Started with Log::Log4perl LoggerLoopsforeach loops Loop through a file until line match Moving onto next value in a loop (next)Nested 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 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 Regular expression delimiter Replace text in a file (-pi -e =~)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 $_)return value in a subroutineVariables / ScalarsGetting Started with scalars and variables Append values to a variable (.=)Determine if a variable in 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)