在bash中格式化電子郵件輸出

Question

我正在編寫一個腳本，該腳本在用戶的AWS訪問密鑰過舊時向其發送電子郵件。

現在，輸出如下所示：

Hello tdunphy, \n Your access key: AKIAICDOHVTMEAB6RM5Q was created on Wed Feb  7 22:55:51 EST 2018 and needs to be replaced. All AWS Keys need to be replaced if they are older than 90 days. \n Regards, \n Cloud Ops

我希望消息看起來像這樣：

Hello tdunphy,

 Your access key: AKIAICDOHVTMEAB6RM5Q was created on Wed Feb  7 22:55:51 EST 2018 and needs to be replaced. All AWS Keys need to be replaced if they are older than 90 days.

Regards,
Cloud Ops

這是設置消息正文的行：

 MAIL_TXT1="Hello $user_name, \\n Your access key: $user_access_key1 was created on $date1 and needs to be replaced. All AWS Keys need to be replaced if they are older than 90 days. \\n Regards, \\n Cloud Ops"

為什么在此示例中換行符不起作用？ 我該如何工作？

Answer 1

您可以使用：

template=$'Hello tdunphy, \n Your access key: AKIAICDOHVTMEAB6RM5Q was created on Wed Feb  7 22:55:51 EST 2018 and needs to be replaced. All AWS Keys need to be replaced if they are older than 90 days. \n Regards, \n Cloud Ops'

然后任一echo起作用：

$ echo "$template"
Hello tdunphy, 
 Your access key: AKIAICDOHVTMEAB6RM5Q was created on Wed Feb  7 22:55:51 EST 2018 and needs to be replaced. All AWS Keys need to be replaced if they are older than 90 days. 
 Regards, 
 Cloud Ops

或printf ：

$ printf "%s" "$template"
 Your access key: AKIAICDOHVTMEAB6RM5Q was created on Wed Feb  7 22:55:51 EST 2018 and needs to be replaced. All AWS Keys need to be replaced if they are older than 90 days. 
 Regards, 
 Cloud Ops

使用printf您還可以更輕松地組裝模板字段：

$ t2=$'Fields:\n\tf1=%s\n\tf2=%s'
$ printf "$t2" 101 102
Fields:
    f1=101
    f2=102