[linux] ubuntu 切換默認的/bin/sh

背景

ubuntu 默認的sh, 也就是/bin/sh默認被切換成了dash，dash體積相對於bash更小，並且性能相對於bash更好， 但是有些情況下，需要默認的/bin/sh 為shell

使用命令

sudo dpkg-reconfigure dash

選擇no

輸出log

Removing 'diversion of /bin/sh to /bin/sh.distrib by dash'
Adding 'diversion of /bin/sh to /bin/sh.distrib by bash'
Removing 'diversion of /usr/share/man/man1/sh.1.gz to /usr/share/man/man1/sh.distrib.1.gz by dash'
Adding 'diversion of /usr/share/man/man1/sh.1.gz to /usr/share/man/man1/sh.distrib.1.gz by bash'

$ ls -l /bin/sh
lrwxrwxrwx 1 root root 4 Aug 19 14:26 /bin/sh -> bash