/usr/bin/word-at-a-time is in ncbi-entrez-direct 7.40.20170928+ds-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/bash -norc
sed 's/[^a-zA-Z0-9]/ /g; s/^ *//' |
tr 'A-Z' 'a-z' |
fmt -w 1
|