in reply to Perl Problems with Digit Precision Changing on the Printf Statement

You need to define "doesn't work" and state what results you expected. 

freebie:~ 604> perl -le '$a="abc"x3;for $w (10, 15, 20) { printf "|%-$
+{w}s|\n", $a }'
|abcabcabc |
|abcabcabc      |
|abcabcabc           |

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