《私房菜》上的shell脚本问题：
转载：[: 11: y: unexpected operator问题
脚本如下：%
#!/bin/bash # Program: # This program shows the user‘s choice # History: #2018/01/03 PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin& export PATH read -p "Please input (Y/N): " yn [ "$yn" == "Y" -o "$yn" == "y" ] &&echo "OK, continue" && exit0 [ "$yn" == "N" -o "$yn" == "n" ] &&echo "Oh, interrupt!" && exit0 echo "I don‘t know what your choice is"&& exit 0
执行时总提示错误9
Please input (Y/N): y [: 10: y: unexpected operator [: 11: y: unexpected operator I don‘t know what your choice is
因为ubuntu默认的sh是连接到dash的,又因为dash跟bash的不兼容所以出错了.执行时可以把sh换成bash文件名.sh来执行.成功.dash是什么东西,查了一下,应该也是一种shell,貌似用户对它的诟病颇多.
by the way修改sh默认连接到bash的一种方法：
sudo dpkg-reconfigure dash0 Q$ c+ `. U+ c2 K
选择no即可.
