echo命令中的命令或别名(Linux Ubuntu Bash)

Question

我创建了一个名为usernum的永久别名,如下所示:

usernum='who | wc -l'

它只返回有多少用户.我正在尝试将以下命令放入cronjob中.

echo "The following number of users are logged in: $usernum"

但是,这只是回声:

The following number of users are logged in:

如何使命令可以在带有替换的echo命令的字符串中使用？

Answer 1

改成:

alias usernum='who | wc -l'
echo "The following number of users are logged in: $(usernum)"
The following number of users are logged in: 1