/usr/share/doc/m4/examples/esyscmd.m4 is in m4 1.4.18-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | define(`hostname', esyscmd(`hostname'))dnl
`hostname = >>'hostname`<<'
define(`hostname',
pushdef(`_tmp', `$1')_tmp(translit(esyscmd(`hostname'), `.', `,'))`'popdef(`_tmp'))dnl
`hostname = >>'hostname`<<'
|