在 Hacker News 首頁上看到 FreeBSD 把 root 的 shell 從 /bin/csh 換成 /bin/sh 了：「sh(1): make it the default shell for the root user」，Hacker News 上的討論也可以看一看：「FreeBSD switches the default root shell from csh to sh (freebsd.org)」。
依照說明是把 FreeBSD 的 /bin/sh 加上了不少東西，所以算是堪用了：
In the recent history sh(1) has gain the missing features for it to become a usable interractive shell: - command completion - persistent history support - improvements on the default bindings in emacs mode - improvements in the vi mode (repect $EDITOR) - print a newline when exiting via ^D - default prompt and improvements on how PS1 can be configured - and more. This changes also simplifies making tiny freebsd images with only sh(1) as a shell