rsync 错误：使用包含“*”的源时特点
在我的 TCL 脚本中，我使用 rsync 命令，不幸的是它拒绝同步包含“*”字符的路径。
代码示例：
set srs "/users/home/username/common/*"
catch {exec rsync -av $src /tmp} res
puts $res
输出：
building file list ... done
sent 29 bytes received 20 bytes 98.00 bytes/sec
total size is 0 speedup is 0.00
rsync: link_stat "/users/home/username/common/*" failed: No such file or directory (2)
rsync error: some files could not be transferred (code 23) at main.c(977) [sender=2.6.9]
while executing
"exec rsync -rLptgov $src /tmp "
In my TCL script I use rsync command and unfortunately it is refusing to sync path contain "*" character.
Code Example:
set srs "/users/home/username/common/*"
catch {exec rsync -av $src /tmp} res
puts $res
Output:
building file list ... done
sent 29 bytes received 20 bytes 98.00 bytes/sec
total size is 0 speedup is 0.00
rsync: link_stat "/users/home/username/common/*" failed: No such file or directory (2)
rsync error: some files could not be transferred (code 23) at main.c(977) [sender=2.6.9]
while executing
"exec rsync -rLptgov $src /tmp "
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规范的写法是：
这是因为 Tcl 默认情况下不扩展 glob 元字符；这种方式更安全，并且更容易编写正确的代码（编写能够抵抗该领域问题的良好 shell 代码很难），但这确实意味着您需要做一些额外的工作。额外的工作是：
glob命令请求$srs的 glob 扩展。这会返回一个列表。{*}伪运算符将列表扩展到glob之外（它不是一个运算符 — 从技术上来说它是一种语法 — 但它的工作原理是很多像一个）。如果您使用的是 Tcl 8.4（或之前的版本！），那么您的做法有点不同：
好的，
有时通常会通过省略list位来缩短（并且有有很多更晦涩的书写方式！）但这是一个坏习惯，因为在处理具有不“好”值的变量时（例如，路径名中带有空格），它可能会导致巨大的问题。如果您有 8.5 或更高版本，请使用{*}。真的。The canonical way of writing that is:
This is because Tcl doesn't expand glob metacharacters by default; it's safer that way and easier to write correct code (it's hard to write good shell code that is resistant to problems in this area) but it does mean that you need to do a little extra work. The extra work is:
$srswith theglobcommand. That returns a list.globby using the{*}pseudo-operator (it's not an operator — it's technically a kind of syntax — but it works a lot like one).If you're using Tcl 8.4 (or before!) then you do it a bit different way:
OK, that's
sometimesoften shortened by leaving out thelistbits (and there are many more obscure ways of writing it!) but that's a bad habit as it can cause huge problems when dealing with variables with values that aren't “nice”, e.g., with spaces in pathnames. If you have 8.5 or later, use{*}. Really.要详细说明 GrAnd 所说的内容，您必须显式构建源文件列表，可能使用
glob，所以你可以这样做，或者使用
{*}来扩展exec的参数列表（这适用于 Tcl >= 8.5） ， 像这样：更新：修复了示例，使其真正有效。
To elaborate on what GrAnd said, you have to build the list of source files explicitly, probably using
glob, so you'd do it like thisor, alternatively, use
{*}to expand the agument list forexec(this is for Tcl >= 8.5), like this:Update: fixed example so that it really works.
这是因为 tcl 解释器不会像 shell 那样扩展“*”符号。
例如：
That's because tcl interpreter does not expand the '*' symbol as shell does.
For example: