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Rename - what does s// vs y// mean?

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linux-howto

http://askubuntu.com – The man page (http://manpages.ubuntu.com/manpages/dapper/man1/prename.1.html) gives two examples: rename ’s/\.bak$//’ *.bak rename ’y/A-Z/a-z/’ * So it's either s or y and then /replaceThis/withThis What does the leading s and y mean? Are there other options? (HowTos)