What is your single most favorite command-line trick using Bash? -

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we know how use <ctrl>-r reverse search through history, did know can use <ctrl>-s forward search if set stty stop ""? also, have ever tried running bind -p see of keyboard shortcuts listed? there on 455 on mac os x default.

what single favorite obscure trick, keyboard shortcut or shopt configuration using bash?

renaming/moving files suffixes quickly:
cp /home/foo/realllylongname.cpp{,-old}

this expands to:
cp /home/foo/realllylongname.cpp /home/foo/realllylongname.cpp-old


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