问题1:

由于以下内容替换为${1}1，因此无法替换为$1和1.

There's no way to replace with $1 followed by 1 since the following replaces with ${1}1.

$ script '${1}1'
${1}1${1}1

问题2:

Problem 2:

$ script '\${ system "echo rm -rf /" }'
rm -rf /
Use of uninitialized value in substitution iterator at a.pl line 12.
rm -rf /
Use of uninitialized value in substitution iterator at a.pl line 12.

问题3:

Problem 3:

$ script '$1{ system "echo rm -rf /" }'
rm -rf /
Use of uninitialized value within %1 in string at (eval 1) line 1.
rm -rf /
Use of uninitialized value within %1 in string at (eval 2) line 1.

当然，还有其他人.解决方案:

Surely, there are others. Solution:

使用 String :: Substitution .