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perl execute shell command and get output perl execute system command perl exit codes perl exit foreach loop perl exit script perl exit while perl exponential notation perl expression perl expression syntax perl extension perl extract substring between two patterns perl fetchrow perl fetchrow array example perl file copy move perl file functions perl file stat perl find string in string perl floor function perl floor int perl flush stdout perl fopen perl for loop array perl for loop syntax perl foreach array perl foreach array of arrays perl foreach break perl foreach continue perl foreach counter perl foreach keys perl foreach last perl foreach split perl fork wait perl function arguments perl function definition perl function reference perl get file extension perl get length of array perl get length of string perl get process id perl getopt long example perl getopts example perl glob directory perl glob recursive perl greater than or equal to perl greedy perl grep array perl grep hash perl gsub perl hash array push perl hash keys order perl hash keys values perl hash of arrays perl hash push perl hash size perl hash table example perl here document perl heredoc perl hex to ascii perl hex to decimal perl history perl html encode perl html entities perl html to pdf perl http response example perl if not exists perl if statement string perl increment perl init hash perl initialize array perl initialize hash perl initialize variable perl int perl integer comparison perl array perl join array perl join command perl join example perl join string perl join two arrays perl json decode hash perl json encode perl json parser example perl kill process perl left string perl length function perl lexical variable perl libxml example perl libxml tutorial perl libxml xpath perl load array perl localtime example perl logical operators perl logical operators example perl lookbehind perl loop next perl loop over array perl loop through array perl loop through files in directory perl ltrim perl mail sender example