Under Linux:
This code, named replace_applet.sh, adds a archive parameter (classes.jar) to all applet tags for *.htm files in a directory.

ls *.htm | while read x do cat $x | sed -e '/<APPLET/ { s/<APPLET /<APPLET archive="classes.jar"/}' > $x.$$ cp $x.$$ $x rm $x.$$done
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