Install nkf

sudo aptitude install nkf

usege

nkf -wLu --overwrite *.txt
# -w: change to UTF8
# -Lu: change to LF
# --overwrite: overwrite file!

Exclude .git or and so on files, and specified some extension.

find . \( -name "i18n" -o -name ".git" -o -name "jquery*.js" -o -name "jquery*.css" \) -prune -o -type f \( -name "*.txt" -o -name "*.js" -o -name "*.css" -o -name "*.html" -o -name "*.php" \) -print -exec nkf -wLu --overwrite {} \;