Copy files matching a regular expression to a new name
for i in `ls *_1.png`; do echo $i; cp $i `echo $i|ruby -pe '$_.sub!(/_1/, "_0")'`; done
TextSnippets > sjspig > ruby
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for i in `ls *_1.png`; do echo $i; cp $i `echo $i|ruby -pe '$_.sub!(/_1/, "_0")'`; done