This script actually used for multiline replacing href in ~/.local/share/okular/bookmarks.xml

okular-bookmarks-restore.sh

#!/usr/bin/env sh

echo ${1:?Destination path is not specified}

export lines=$(cat $1 | egrep '<folder href|<bookmark href')
export IFS=$(printf '>')
# sed -i 's,link,new-link,g' $1
function main () {
	for line in $lines; do
		# echo "Current line>"$line
		if test $(echo $line | grep -o "DELETED|" | wc -m) -ne 0; then
			continue
		elif test $(echo $line | grep -o "Education" | wc -m) -eq 0; then
			export clear_href=$(tr -d '\n' <<< $(echo $line | cut -d '"' -f 2))
			export clear_href_decoded=$(echo $clear_href | sed -e "s/%\([0-9A-F][0-9A-F]\)/\\\\\x\1/g" | xargs -0 echo -e)
			export href=$(echo $clear_href | cut -f1 -d"#")
			printf 'Change for: %s'$clear_href_decoded
			echo
			if test $(echo $href | wc -m) -ge 2; then
				read new_href
				if [[ $new_href == "del" ]]; then
					echo "Marking $href as DELETED"
					export replace_string="DELETED|"$href
					sed -i "s,$href,$replace_string,g" $1
					export lines=$(cat $1 | egrep '<folder href|<bookmark href')
					main $1
				else 
					if test $(echo $new_href | wc -m) -le 1; then
						continue
					else 
						#export href_esc=$(sed 's/\%/\\%/g' <<< $href)
						echo "OLD HREF: "$href
						echo "NEW HREF: "$new_href
						sed -i "s|$href|$new_href|g" $1
						export lines=$(cat $1 | egrep '<folder href|<bookmark href')
						main $1
					fi				
				fi
			else
				echo "Href is empty. Passing..."
				continue
			fi 
		else
			continue
		fi
	done
}

main $1

Destination path is ~/.local/share/okular