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December 11, 2015 07:59
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one liner / rename directory at current directory yyyymmdd -> yyyy_mm_dd / scan / sub
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| $ ls | ruby -nle '$_.scan(/\d{8}/) {|m| File.rename(m, m.sub(/(\d{4})(\d{2})(\d{2})/) {"#{$1}_#{$2}_#{$3}"})}' |
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