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December 24, 2015 13:48
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zero padding one-liner for underscore separated file name e.g.
foo_1_bar.jpg
foo_2_bar.jpg ↓ foo_001_bar.jpg
foo_002_bar.jpg
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| ls | ruby -n -e '/([^_]*_)([^_]*)(_.*)/ =~ $_; puts "%s%03d%s"%[$1, $2, $3]' |
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