If any part of a shell command is enclosed by back quotes (a character also known as a grave accent), it is executed and the output placed on the command line.

如果shell脚本的某一部分用单引号(也称为重单符)括起来，那么将执行这个部分并将结果放在该命令行内。

youdao

If any part of a shell command is enclosed by back quotes (a character also known as a grave accent), it is executed and the output placed on the command line.

如果shell脚本的某一部分用单引号(也称为重单符)括起来，那么将执行这个部分并将结果放在该命令行内。

youdao