If you have a directory with a lot of wrong symlinks that you need to update, you can use this bash script to partially replace strings in the target path.
#/bin/bash SEARCHPATH=/etc/alternatives #Directory containing wrong symlinks FILTERSTRING=openjdk #String to filter list of symlinks to update (using grep) SEARCHSTRING=java-6-openjdk #String to search in symlink target path REPLACESTRING=java-6-sun #String to replace in symlink target path find ${SEARCHPATH} -type l | while read LINK; do TARGET=$(readlink $LINK) if `echo ${TARGET} | grep "${FILTERSTRING}" 1>/dev/null 2>&1`; then TARGET=`echo ${TARGET} | sed "s#${SEARCHSTRING}#${REPLACESTRING}#g"` echo "executing: ln -sf \"${TARGET}\" \"${LINK}\"" ln -sf "${TARGET}" "${LINK}" fi done
Disclaimer: This is the first bash script I’ve ever written, use on your own risk 
But it worked on my computer.
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