perltutorial root elsif else if if statements test a control statement to see whether it is [what is true and false in perl?|true or false]. else and elsif clauses can also be tagged on the back. <code> #your basic if if(\$value==1){ print "value is equal to 1\n"; } #your basic if/else if(\$value==1){ print "value is equal to 1\n"; } else{ print "value is not equal to 1\n"; } #your basic if/elsif/else if(\$value==1){ print "value is equal to 1\n"; } elsif(\$value==2){ print "value is equal to 2\n"; } elsif(\$value==3){ print "value is equal to 3\n"; } else{ print "value is not equal to 1,2, or 3\n"; } </code> [Unless statements] offer you the opposite functionality. If the control statement evaluates to false then the statements inside the block are executed.
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