在TCL中，如何使一个变量使用另一个变量的值
我需要在另一个变量中使用一个变量的值。
这就是我尝试过的..
set cmd_ts "foo bar"
set confCmds {
command1
command2
$cmd_ts
}
puts "confCmds = $confCmds"
但
confCmds =
command1
command2
foo bar
我没有得到：
confCmds =
command1
command2
$cmd_ts
PS 我尝试了以下无济于事
- $cmd_ts
- "$cmd_ts"
- {$cmd_ts}
- \$cmd_ts
I need to use the value of a variable inside another variable.
This is what I tried..
set cmd_ts "foo bar"
set confCmds {
command1
command2
$cmd_ts
}
puts "confCmds = $confCmds"
But instead of getting
confCmds =
command1
command2
foo bar
I am getting:
confCmds =
command1
command2
$cmd_ts
P.S. I tried the following to no avail
- $cmd_ts
- "$cmd_ts"
- {$cmd_ts}
- \$cmd_ts
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（3）
如果您必须按原样定义列表，则还可以使用 subst 命令，该命令将执行大括号阻止的替换：
If you must have the list defined as you have it, you can also use the subst command, which will perform the substitution that the curly braces are preventing:
（几乎）只要使用花括号，什么都不会起作用。 最好的建议是使用 list 命令：
我说（几乎）是因为您可以使用 subst 在 confCmds 上进行变量替换，但这并不是您真正想要的，而且充满危险。 您想要的是一个单词列表，其中一个或多个可以由变量定义。 这正是上述解决方案为您提供的。
如果需要，您可以使用反斜杠将命令分散到多行上：
此解决方案假定您想要的是一个 tcl 列表。 这可能是也可能不是您想要的，这完全取决于您如何在下游处理这些数据。
在评论中，您写道，您真正想要的是一串以换行符分隔的项目，在这种情况下，您可以只使用双引号，例如：
这将为您提供一个由换行符分隔的多行字符串。 尝试将其视为命令列表时要小心（即：不要执行“foreach foo $confCmds”），因为它可能会失败，具体取决于 $cmd_ts 中的内容。
(almost) nothing will work as long as you use curly braces. The best suggestion is to use the list command:
I say (almost) because you can use subst to do variable substitution on confCmds, but that's not really what you want and that is fraught with peril. What you want is a list of words, one or more of which may be defined by a variable. That is precisely what the above solution gives you.
If you want, you can spread the commands on more than one line by using the backslash:
This solution assumes that what you want is a tcl list. This may or may not be what you want, it all depends on how you treat this data downstream.
In a comment you wrote that what you really want is a string of newline-separated items, in which case you can just use double quotes, for example:
That will give you a string with multiple lines separated by newlines. Be careful of trying to treat this as a list of commands (ie: don't do 'foreach foo $confCmds') because it can fail depending on what is in $cmd_ts.
布莱恩的回答很好，除了我的代表无法修复的拼写错误。 （第一个命令中的列表应以方括号结束）。
如果您想对命令执行任何有用的操作，您可能希望将它们作为列表，但如果您只想将它们用新行分隔，请在最后执行以下操作：
Bryan's answer is good, apart from a typo I can't fix with my rep. (the list in the first command should be ended with a square bracket).
If you want to do anything useful with the commands, you probably want them as a list, but if you just want them separated by a new line do this at the end: