Expect 字符串连接选项卡
Tab on Expect String concatenation
我是 Expect 的新手，但我无法解决我在编写的日志记录监控脚本中遇到的问题。
我花了几个小时谷歌搜索为什么我不能让它工作：
puts $redirect [concat "${time}\t" "${context}\t" "$id\t" "${eventtype}" "${eventstatus}\t" "${eventcontext}" ]
\t 字符（即使与其他 \chars 也不起作用）没有显示。不管我把它放在哪里，我都尝试过不同的东西：
puts $redirect [concat "${time}" "\t" "${context}" [...] ]
puts $redirect [concat "${time}\t" "${context}" [...] ]
puts $redirect [concat "${time}" "\t${context}" [...] ]
puts $redirect [concat "${time}" \t "${context}" [...] ]
*重定向是 set redirect [open $logfile a]
*其中 [...] 是我以相同方式连接的其他字符串。
来自http://tcl.tk/man/tcl8.5/TclCmd/Tcl.htm#M10
[5] Argument expansion.
If a word starts with the string “{}” followed by a non-whitespace character, then the leading “{}” is removed and the
rest of the word is parsed and substituted as any other word. After
substitution, the word is parsed as a list (without command or
variable substitutions; backslash substitutions are performed as is
normal for a list and individual internal words may be surrounded by
either braces or double-quote characters), and its words are added to
the command being substituted. For instance, “cmd a {}{b [c]} d
{}{$e f "g h"}” is equivalent to “cmd a b {[c]} d {$e} f "g h"”.
[6] Braces.
If the first character of a word is an open brace (“{”) and rule [5] does not apply, then the word is terminated by the matching close
brace (“}”). Braces nest within the word: for each additional open
brace there must be an additional close brace (however, if an open
brace or close brace within the word is quoted with a backslash then
it is not counted in locating the matching close brace). No
substitutions are performed on the characters between the braces
except for backslash-newline substitutions described below, nor do
semi-colons, newlines, close brackets, or white space receive any
special interpretation. The word will consist of exactly the
characters between the outer braces, not including the braces
themselves.
讽刺的是，我可以让它工作：
puts $redirect [concat "${time}\n" "-\t${context}" [...] ]
如果我在 TAB 之前放一个字符，它可以工作，但我不能使用它。
Ex 输出：2016-06-01 15:43:12 - macro
想要的输出：2016-06-01 15:43:12 macro
我试过用 append 构建字符串，但由于最大缓冲区字符，它好像正在吃掉一些字符串，这可能吗？
我错过了什么吗？
谢谢指教。
这就是 concat 所做的。它吃掉空格。
来自 concat 的文档：
This command joins each of its arguments together with spaces after trimming leading and trailing white-space from each of them. If all the arguments are lists, this has the same effect as concatenating them into a single list. It permits any number of arguments; if no args are supplied, the result is an empty string.
@Etan 告诉你为什么它不适合你。
另一种编码方式是使用format
puts $redirect [format "%s\t%s\t%s\t%s%s\t%s" $time $context $id $eventtype $eventstatus $eventcontext]
我是 Expect 的新手，但我无法解决我在编写的日志记录监控脚本中遇到的问题。
我花了几个小时谷歌搜索为什么我不能让它工作：
puts $redirect [concat "${time}\t" "${context}\t" "$id\t" "${eventtype}" "${eventstatus}\t" "${eventcontext}" ]
\t 字符（即使与其他 \chars 也不起作用）没有显示。不管我把它放在哪里，我都尝试过不同的东西：
puts $redirect [concat "${time}" "\t" "${context}" [...] ]
puts $redirect [concat "${time}\t" "${context}" [...] ]
puts $redirect [concat "${time}" "\t${context}" [...] ]
puts $redirect [concat "${time}" \t "${context}" [...] ]
*重定向是 set redirect [open $logfile a]
*其中 [...] 是我以相同方式连接的其他字符串。
来自http://tcl.tk/man/tcl8.5/TclCmd/Tcl.htm#M10
[5] Argument expansion. If a word starts with the string “{}” followed by a non-whitespace character, then the leading “{}” is removed and the rest of the word is parsed and substituted as any other word. After substitution, the word is parsed as a list (without command or variable substitutions; backslash substitutions are performed as is normal for a list and individual internal words may be surrounded by either braces or double-quote characters), and its words are added to the command being substituted. For instance, “cmd a {}{b [c]} d {}{$e f "g h"}” is equivalent to “cmd a b {[c]} d {$e} f "g h"”.
[6] Braces. If the first character of a word is an open brace (“{”) and rule [5] does not apply, then the word is terminated by the matching close brace (“}”). Braces nest within the word: for each additional open brace there must be an additional close brace (however, if an open brace or close brace within the word is quoted with a backslash then it is not counted in locating the matching close brace). No substitutions are performed on the characters between the braces except for backslash-newline substitutions described below, nor do semi-colons, newlines, close brackets, or white space receive any special interpretation. The word will consist of exactly the characters between the outer braces, not including the braces themselves.
讽刺的是，我可以让它工作：
puts $redirect [concat "${time}\n" "-\t${context}" [...] ]
如果我在 TAB 之前放一个字符，它可以工作，但我不能使用它。
Ex 输出：2016-06-01 15:43:12 - macro
想要的输出：2016-06-01 15:43:12 macro
我试过用 append 构建字符串，但由于最大缓冲区字符，它好像正在吃掉一些字符串，这可能吗？
我错过了什么吗？ 谢谢指教。
这就是 concat 所做的。它吃掉空格。
来自 concat 的文档：
This command joins each of its arguments together with spaces after trimming leading and trailing white-space from each of them. If all the arguments are lists, this has the same effect as concatenating them into a single list. It permits any number of arguments; if no args are supplied, the result is an empty string.
@Etan 告诉你为什么它不适合你。
另一种编码方式是使用format
puts $redirect [format "%s\t%s\t%s\t%s%s\t%s" $time $context $id $eventtype $eventstatus $eventcontext]