updateManySymlink.sh

#!/bin/bash
# Adaptation of: https://stackoverflow.com/questions/31020219/how-change-symlink-path-for-many-files
run_mode=false
[ $# -eq 3 ] && [ $3 = "run" ] && run_mode=true
if [ $# -ne 2 ] && [ "$run_mode" = false ]; then
	echo "Usage:";
	echo "- dry-run: ./scriptname oldpath newpath";
	echo "- run: ./scriptname oldpath newpath run";
	exit -1;
fi

oldpath=$1
newpath=$2
error_file="/tmp/$(basename $0).log"

echo "******************"
echo "old path: $oldpath"
echo "new path: $newpath"
echo "error file: $error_file"
if [ "$run_mode" = false ]; then
	echo "running in dry-run mode."
fi
echo -e "******************\n"

find . -type l -execdir bash -c 'p="$(readlink "{}")"; if [ "${p:0:1}" != "/" ]; then p="$(echo "$(pwd)/$p" | sed -e "s|/\./|/|g" -e ":a" -e "s|/[^/]*/\.\./|/|" -e "t a")"; fi; if [ "${p:0:'${#oldpath}'}" == "'"$oldpath"'" ]; then \
	echo "-----"; \
	echo "pwd: "$(pwd); \
	echo "link name: ""{}"; \
	echo "old link: "$p; \
	echo "new link: ""'"$newpath"'${p:'${#oldpath}'}"; \
	if [ '"$run_mode"' = true ]; then \
		ln -sf "'"$newpath"'${p:'${#oldpath}'}" "{}"; \
		echo "Done."; \
	fi; \
	echo -e "-----\n"; \
fi;' \; 2> $error_file

echo "$(cat $error_file | wc -l) errors. You can find the logs in $error_file"