Backup source of Shell (No. 3)

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- UNIX & Linux コマンド・シェルスクリプト リファレンス
--  http://www.geocities.jp/geo_sunisland/

* ノウハウ [#n64be415]

- Tips: 実行中のシェルスクリプトを書きかえるときには
--   https://qiita.com/kitsuyui/items/d0048eeaa50293a92a60

- The first two statements of your BASH script should be…
--  https://ashishb.net/all/the-first-two-statements-of-your-bash-script-should-be/

 !/usr/bin/env bash
 set -euo pipefail
>
“set -e” which ensures that your script stops on first command failure. By default, when a command fails, BASH executes the next command. Looking at the logs, you might feel that the script executed successfully while some commands might have failed. Caveat: Be careful about applying it to existing scripts.
>
“set -u” which ensures that your script exits on the first unset variable encountered. Otherwise, bash replaces the unset variables with empty default values.
>
“set -o pipefail” which ensures that if any command in a set of piped commands failed, the overall exit status is the status of the failed command. Othe