bash で日付とか時刻の連番とか

Makefile

TODAY := $(shell date --iso-8601="seconds")
N := 7

from = $(shell date +'%Y-%m-%d %H:00:00' -d '${TODAY} $1 day ago 1 day ago')
to   = $(shell date +'%Y-%m-%d %H:00:00' -d '${TODAY} $1 day ago')

define bt
    @ echo "BETWEEN '${from}' AND '${to}'"

endef

range:
    $(foreach n,$(shell seq ${N}),$(call bt, ${n}))

output.nd

```
$ make
BETWEEN '2021-05-15 20:00:00' AND '2021-05-16 20:00:00'
BETWEEN '2021-05-14 20:00:00' AND '2021-05-15 20:00:00'
BETWEEN '2021-05-13 20:00:00' AND '2021-05-14 20:00:00'
BETWEEN '2021-05-12 20:00:00' AND '2021-05-13 20:00:00'
BETWEEN '2021-05-11 20:00:00' AND '2021-05-12 20:00:00'
BETWEEN '2021-05-10 20:00:00' AND '2021-05-11 20:00:00'
BETWEEN '2021-05-09 20:00:00' AND '2021-05-10 20:00:00'
```