bash 邮件：主题中的命令输出
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bash mail: command output in subject
提问by JuanPablo
I try send a mail with mailcommand, with the output of other command in the subject
我尝试使用mail命令发送邮件，主题中包含其他命令的输出
subj="hello from $(hostname -s) $(date)"
echo "data" | mail -s $subj mail@mail
but I only get the first part of subject (hello from).
但我只得到主题 ( hello from)的第一部分。
why?
为什么？
回答by dogbane
You need to quote your subject, like this:
你需要引用你的主题，像这样：
echo "data" | mail -s "$subj" mail@mail
If you don't quote it, the mailprogram will not know where your subject ends and will take the first "word" (hello) as the subject and everything else as an address.
如果您不引用它，mail程序将不知道您的主题在哪里结束，并将第一个“单词”（hello）作为主题，其他所有内容作为地址。
In general, it is good practice to always quote your variables.
通常，始终引用变量是一种很好的做法。
回答by Gestudio Cloud
/youScriptOrOutput.sh | mail -s "Subject from host $(hostname -s) $(date)" [email protected]
/youScriptOrOutput.sh | mail -s "主题来自主机 $(hostname -s) $(date)" [email protected]
