xargs -I{} -L1 find /dev -mmin {} -exec sed -i '/sbin/i print ' {} \;

This command will find all files in the /dev directory that have been modified within the last {} minutes, and for each of those files, it will insert the text "print" before the text "sbin" in the file.
xargs -I{} -L1  find /dev -mmin {} -exec sed -i '/sbin/i print ' {} \;