#!/bin/sh
JOURNAL="$HOME/nfs/idk"

tmp="$(mktemp /tmp/journal.XXXXXX)"

d="$(date -I)"
grep "$d" "$JOURNAL" || printf "%s\n" "$d" > "$tmp"

"${EDITOR:-vi}" "$tmp"
tail "$JOURNAL"
(printf "\n"; cat "$tmp" | tee -a "$JOURNAL") && rm "$tmp"