#!/usr/bin/env sh
# backup, timestamped
# YES_ZSH
# YES_BASH
# YES_DASH

: $((SOURCING+=1))
#. ~/sh/note # FIXME: don't do this?
: $((SOURCING-=1))

baks() { ### @-
    local ret=0
    for fp; do
        local now="$(date -u '+%y-%m-%d_%H-%M-%S')"
        local bak="$fp.$now.bak"
        if [ -s "$bak" ]; then
            #note "how in the hell?" "$bak" "already exists"
            printf "%s %s %s\n" "how in the hell?" "$bak" "already exists"
            ret=1
        fi
        cp -p "$fp" "$bak" || ret=1
    done
    return $ret
}

[ "${SOURCING:-0}" -gt 0 ] || baks "$@"