Sed

General

• usage sed 'expression' < in >out
• Enclose regexp within single quote
• sed one-liners
• nice primer
• sed 's/\\n\\n/\\n/g' < chat.html > less_spaces.html

On Mac OSX

1. brew install gnu-sed
2. find . -name "*.i" -exec gsed -i 's/pychrm/wndcharm/g' {} \;