For every nth you can use modulus operator:

perl -e 'for(1..100){ if($_%6==0){print qq|$_ sixth\n|;} };'
6 sixth
12 sixth
18 sixth
24 sixth
30 sixth
36 sixth
42 sixth
48 sixth
54 sixth
60 sixth
66 sixth
72 sixth
78 sixth
84 sixth
90 sixth
96 sixth

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In reply to Re: foreach loop by InfiniteSilence
in thread foreach loop by Anonymous Monk

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