Man page of date command should make explicit that -d and -r options are mutually exclusive.
date -d -3 minutes -r tmp.txt "+%Y%m%d_%H%M" date: the options to specify dates for printing are mutually exclusive
Man page of date command should make explicit that -d and -r options are mutually exclusive.
date -d -3 minutes -r tmp.txt "+%Y%m%d_%H%M" date: the options to specify dates for printing are mutually exclusive