read -p 'replay name: ' name
if [ ! "$name" ]; then name=1x2; fi
case "$name" in
+[0-9]*[a-z][a-z][1-9]x[1-9])
+ ago=${name:0:1}
+ name=${name:${#ago}}
+ name=$(date +%Y%m%d -d "$ago day ago")"$name"
+ echo "Only postfix specified; using $name"
+ ;;
[1-9]x[1-9])
name=$(date +%Y%m%d)"bn$name"
echo "Only postfix specified; using $name"