TCL/TK 中的 SED 和 TCL 中的任何其他等效命令

问题描述

我现在正在尝试使用过程调用"将值从 TK 传递到 cshell 脚本......如下所示.

I am trying pass value from TK to cshell script using "procedure call" now.... as follow.

proc Run {} {
   global passedvalue
   ## to see what value it has for passedvalue
   puts  $passedvalue
   exec sed -i {s/ABC/$passedvalue/g} runme.sh
   exec /bin/csh -c ./runme.sh >@stdout 2>@stderr
}

我正在通过新的传递值更改具有 ABC 值的行.puts"工作并正确打印passedvalue的值.但它不适用于 sed 并且它给出了

I am changing a line which has value ABC by new passedvalue."puts" works and prints the value of passedvalue properly.But it does not work for sed and it gives

错误:程序未定义变量

请告诉我我哪里做错了.

Please let me know how where I am doing wrong.

我也尝试过使用字符串映射，但也确实有效……我可能做错了什么.

I have tried using string map as well but did work either...I might be doing something wrong.

推荐答案

大括号禁止变量替换.如果您希望在调用 exec 之前扩展 $passedvalue，则需要使用其他一些引用机制.

Curly braces inhibit variable substitution. If you want $passedvalue to be expanded before calling exec, you'll need to use some other quoting mechanism.

例如，您可以使用双引号:

For example, you could use double quotes:

exec sed -i "s/ABC/$passedvalue/g" runme.sh

但是，您需要添加一些额外的防弹功能.例如，如果 $passedvalue 中有一个 /，您将向 sed 发送一个格式错误的表达式.

You will need to add some extra bullet-proofing, however. For example, if $passedvalue Has a / in it, you will send a mal-formed expression to sed.

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