Доступ к UTF -8 клинописных цифр и знаков препинания

$ hd="$(head -1 file)"; tail +2 file; printf '%s %s\n' "$hd" "$(date)"
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old1 Thu, Jul 25, 2019  4:27:15 PM

$ hd="$(head -1 file)"; { tail +2 file; printf '%s %s\n' "$hd" "$(date)"; } > tmp && mv tmp file; cat file
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old1 Thu, Jul 25, 2019  4:28:44 PM

$ hd="$(head -1 file)"; { tail +2 file; printf '%s %s\n' "$hd" "$(date)"; } > tmp && mv tmp file; cat file
old3
old1 Thu, Jul 25, 2019  4:28:44 PM
old2 Thu, Jul 25, 2019  4:28:46 PM

$ hd="$(head -1 file)"; { tail +2 file; printf '%s %s\n' "$hd" "$(date)"; } > tmp && mv tmp file; cat file
old1 Thu, Jul 25, 2019  4:28:44 PM
old2 Thu, Jul 25, 2019  4:28:46 PM
old3 Thu, Jul 25, 2019  4:28:48 PM