Bash基础——命令替换 Linux 下Shell 脚本几种基本命令替换区别

参考:Linux 下Shell 脚本几种基本命令替换区别

Command substitution

命令替换Command substitution

https://www.jb51.net/article/95585.htm

https://www.cnblogs.com/f-ck-need-u/archive/2017/08/20/7401591.html

https://www.cnblogs.com/itxdm/p/something_of_shellscirpt.html

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