本文探讨了在Ubuntu环境下使用dash shell作为默认shell时，sh脚本中出现let:not found错误的原因及解决方案。通过修改dpkg配置，可以确保使用bash环境，从而在sh文件中正常执行let命令，避免文件丢失等问题。
ubuntu sh ???.sh 时出现 let: not found
（我的sh文件里有mv命令，结果文件全丢失了）
出现问题的原因：It's because Ubuntu uses the dash shell as default and doesn't always recognize when you try to set the shell in a script. Even if you enter "echo $SHELL" into the console it will tell you you're using /bin/bash but for some reason it's actually using dash instead.
#就是bash环境指向了/bin/sh，而在/bin/bash里才有let命令。
解决办法:
sudo dpkg-reconfigure dash
<password>
and when you get the option select"no" to actually use bash instead of dash
其实也可改用 bash ???.sh指令
（我的sh文件里有mv命令，结果文件全丢失了）
出现问题的原因：It's because Ubuntu uses the dash shell as default and doesn't always recognize when you try to set the shell in a script. Even if you enter "echo $SHELL" into the console it will tell you you're using /bin/bash but for some reason it's actually using dash instead.
#就是bash环境指向了/bin/sh，而在/bin/bash里才有let命令。
解决办法:
sudo dpkg-reconfigure dash
<password>
and when you get the option select"no" to actually use bash instead of dash
其实也可改用 bash ???.sh指令
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