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Text Wizardry : Ten Commands
- silentbicycle 18y agofor a in `ls -1 /usr/bin/`; do whatis "$a"; done | less That prints out a list of every command in /usr/bin with a one-line description. sed (transforming pipe with regular expressions) and file (try to identify a file type based on headers and other metadata) are also quite handy. If you find the post interesting, check out Kernighan & Pike's _The Practice of Programming_.