copy files younger than x days to new location and delete files older than x there

gistfile1.txt

#!/bin/bash
source='/srv/dev-disk-by-label-'
target='/srv/dev-disk-by-label-'
days=30

# delete

find ${target} -mtime +$days -type f -exec rm "{}"  \; 
# copy and link
find ${source} -mtime -$days -type f -exec cp -la "{}" ${target} \;