Perl Command Line Arguments | argv - Javatpoint

Command line arguments are sent to a Perl program in the same way as in any other language. The @ARGV array holds the command line argument. 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Perlallowsusing@ARGVarrayasfilenamesbyusing<>.The$ARGVcontainsthenameofthecurrentfilewhenreadingfrom<>. @ARGVarrayelements [email protected]$ARGV[0],second$ARGV[1],andsoon. PerlCommandLineArgumentExample Let'sseeasimpleexampletoprintcommandlinearguments.Inthisexample,wewillprintawelcomemessagewiththeusersnameastheargumentfromthecommandline.Weneedtwocommandlineargumentsasuser'sfirstandlastname. Step1Createascriptwelcome.plinyoursystem. #!/usr/bin/perl-w #(1)checkforthenumberofcommand-lineargumentsentered $number_args=$#ARGV+1; if($number_args!=2){ print"Wrongentry.Pleaseenteryourfullname.\n"; exit; } #(2)iftwocommandlineargumentsreceived, $firstName=$ARGV[0]; $lastName=$ARGV[1]; print"Welcome$firstName$lastNameatJavaTpoint.\n"; Intheabovescript,firstitwillcheckwhethertwocommandlineargumentsareprovidedornot.Ifnot,itwillgivethewrongentryerror.Andifyes,itwillprocessthoseargumentsas$ARGV[0]and$ARGV[1]respectively. Step2Runthescriptinyourconsoleasperlwelcome.plChristianGrey Note:Beforegivingthiscommand,makesureyouareonthedirectorycontainingyourscriptwelcome.pl Thisistheoutputyouwillgetinyourconsole. Step2Runthescriptinyourconsoleasperlwelcome.plChristian Here,wearepassingonlyoneargumentfromthecommandline. Intheoutput,youcanseethewrongentrymessageforpassingoneargument. PerlCommandLineArgumentsExampleusingLoop Nowwewillrunalooptoprintthecommandlinearguments.Inthisexample,youcanenterasmuchargumentasyouwish. Step1Createascriptloop.plinyoursystem. #!/usr/bin/perl $get_args=$#ARGV+1; print"Totalcommandlineargumentsreceived:$get_args\n"; foreach$argument(0..$#ARGV){ print"$ARGV[$argument]\n"; } Step2Runthescriptinyourconsoleasperlloop.plabcdefgh Lookattheoutputabove,italsodisplaystotalargumentspassedoncommandline.Herewehavepassed8arguments. PerlGetopt::Long Thesimplecommandlineoptionsaredoneusing?soption.ComplexcommandlineoptionsaredoneusingGetopt::StdandGetopt::Long. GetoptstandsforGetOptions.Itprocessesthecontentof@ARGVbasedontheconfigurationwegivetoit.Itreturnstrueorfalsevaluebasedontheprocessing. Example: Inthisexample,wewellgettheageoftheuserfromthecommandline. usestrict; usewarnings; use5.010; useGetopt::Longqw(GetOptions); my$x; GetOptions('from=s'=>\$x)ordie"Usage:$0--fromNAME\n"; say"Accordingtoyouragewhichis$x:"; if($x>=18){ say"Youareeligibletovote"; } Wehavedeclaredavariable$xwhichwillstorevalueinsertedinto--fromfromthestandardconsole.Thefrom=sdeclarescommandlineparametercalled--fromwithastringafterit.Itismappedfurthertothevariable$x.Thebackslash(\)meanswearepassingareferencetothevariable. Thisscriptwillswitchtodiepartonlywhenwewillrunthisscriptbypassingsomethingthatlookslikeaparameternameandstartswitha(-)butisnotdeclaredinthisscript. Now,wewillrunthisprogram. Output: Lookattheoutput,afterenteringageontheconsole,wegottheaboveoutput. 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