O'Reilly Media book: Classic Shell Scripting

• http://shop.oreilly.com/product/9780596005955.do
• http://examples.oreilly.com/9780596005955/

nice scripts shown there and available in the sample code:

• pathfind.sh – rather similar to my own find_file_on_PATH.sh
• show-identical-files.sh – rather similar to my own group_by_content.sh – but has a problem with "md5sum"
• puser.sh
• …