find sparse files

find -type f -printf "%S=:=%p\n" 2>/dev/null | gawk -F'=:=' '{if ($1 < 1.0) print $1,$2}'
Prints the path/filename and sparseness of any sparse files (files that use less actual space than their total size because the filesystem treats large blocks of 00 bytes efficiently). Uses a Tasker-esque field separator of more than one character to ensure uniqueness.
Sample Output
$ find /var/log -type f -printf "%S=:=%p\n" 2>/dev/null | gawk -F'=:=' '{if ($1 < 1.0) print $1,$2}'
7.88593e-08 /var/log/with space
1.11717e-07 /var/log/lastlog

2019-02-06 14:12:32

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