$ readonly PI=3.14$ unset PI-bash: unset: PI: cannot unset: readonly variable$ cat << EOF| sudo gdb attach $$ call unbind_variable("PI") detach EOF$ echo $PI$ 本文共 202 字，大约阅读时间需要 1 分钟。
$ readonly PI=3.14$ unset PI-bash: unset: PI: cannot unset: readonly variable$ cat << EOF| sudo gdb attach $$ call unbind_variable("PI") detach EOF$ echo $PI$ 转载于:https://my.oschina.net/mskk/blog/892687