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rc/sh/baknow

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#!/usr/bin/env sh
# YES_ZSH
baknow() { ### @-
### backup a single file by appending its timestamp given by [`now`.](#now)
###
### ```
### $ touch -d '2001-12-25 16:30:00' butts
### $ baknow butts
### $ baknow butts
### cp: overwrite 'butts.2001-12-26_01800000.bak'? n
### $ ls -l
### total 0
### -rw-r--r-- 1 notwa None 0 Dec 25 2001 butts
### -rw-r--r-- 1 notwa None 0 Dec 25 2001 butts.2001-12-26_01800000.bak
### ```
###
### **TODO:** support multiple files at once.
cp -ip "${1:?missing file argument}" "$1.$(now "$1").bak"
}
[ -n "${preload+-}" ] || baknow "$@"