commandlinefu.com is the place to record those command-line gems that you return to again and again.
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For when you need a quick spell check.
xclip -o > /tmp/spell.tmp # Copy clipboard contents to a temp file
aspell check /tmp/spell.tmp # Run aspell on that file
cat /tmp/spell.tmp | xclip # Copy the results back to the clipboard, so that you can paste the corrected text
I'm not sure xclip is installed in most distributions. If not, you can install x11-apps package