https://en.wikipedia.org/wiki/Bourne_shell
Bourne shell - Wikipedia
bourne shellwikipedia
https://manpages.ubuntu.com/manpages/xenial/zh_CN/man1/enable.1.html
Ubuntu Manpage: bash - GNU Bourne-Again SHell (GNU 命令解释程序 “Bourne二世”)
GNU Bourne-Again SHell (GNU 命令解释程序 “Bourne二世”)
bourne again shellubuntumanpagebashgnu