在 Windows 批处理文件中,如果我启用了回显(默认),我可以通过添加前缀 @
来禁用回显单个命令,例如:
some_command_that_will_be_echoed
@some_command_that_wont_be_echoed
但是,我使用 @echo off
禁用了回显,但有时我想要回显该命令。有某种魔法等价物吗?例如:
@echo off
some_command_that_wont_be_echoed
<unknown_magic_prefix> some_command_that_will_be_echoed
我发现了这个问题:turn on echo temporarily ,但这本质上是说“打开回声,做你的事情,然后再次将其关闭”。我可以做到这一点,但我希望有更优雅的东西。
编辑:这个Windows batch file: how to enable inline echo of a command出现在相关问题列表中;这基本上和我的问题相同,而且也同样成功!
编辑2:为了提供上下文,下面是我正在做的部分。请注意,为了这篇文章的利益,我用 C 风格的注释对其进行了修饰;它们不在真实的脚本中。
@echo off // Because I don't want the bulk of the commands displayed.
// (In fact it's worse than that, this file is called from another
// with echo already disabled.)
title CMD Window with SVN enabled
set PATH= ... // my new path which happens to include SVN this time
svn --version --quiet // This command outputs just the SVN version as a number
// but it gets rather lost on its own, and the 'full'
// output is too wordy. My belief is that if the entire
// command was echoed, it would provide a perfect
// context.
echo SVN version is: // This is an obvious alternative, simply putting a
svn --version --quiet // message before the actual command.
echo svn --version --quiet // Or even just echoing the command 'by hand'
svn --version --quiet
+@svn --version --quiet // This imaginary syntax would be the gold-standard
always_echo( svn --version --quiet ) // This function would be acceptable, but
// its definition eludes me and seems
// clunky
<some batch file magic preamble> // This would be okay, but would get arduous
svn --version --quiet // if it was long-winded or had to be done a
<some batch file magic to close> // few times or more.
但要强调的是,虽然这是一个相对容易“修复”的具体示例,但我正在寻找一个更通用的解决方案,可以在其他可能不那么简单的情况下使用它。
@Compo 合理地指出 @echo off
本身并不是很优雅。这很公平,但是 a) 在这种情况下它已经启用了,b) 它非常惯用。我喜欢这个的清晰度(想象的语法):
@echo off
command_1 // not echoed
command_2 // not echoed
+@command_3 // IS echoed and stands out
command_4 // not echoed
对比
@command_1 // not echoed
@command_2 // not echoed
command_3 // IS echoed and gets a little lost
@command_4 // not echoed
显然这是一个主观意见,但归根结底只是为了装饰不常见的情况。
最后,如果这真的不可能,那么也很公平,但是确定也没有坏处:)
最佳答案
您可以使用一个小宏(%+@%
),它会显示命令然后执行它。
@echo off
call :define_macro
setlocal EnableDelayedExpansion
set var=content
%+@% ver
%+@% ver /?
%+@% echo %var% !var!
exit /b
:define_macro
(set \n=^^^
)
set ^"+@=for %%# in (1 2) do if %%#==2 (%\n%
setlocal EnableDelayedExpansion %\n%
for /F "tokens=1,*" %%1 in ("!time: =0! !argv!") do (%\n%
endlocal%\n%
echo %%1 Execute: %%2%\n%
endlocal%\n%
%%2%\n%
)%\n%
) ELSE setlocal DisableDelayedExpansion ^& set argv="
exit /b
输出:
14:04:08,05 Execute: ver
Microsoft Windows [Version 10.0.17134.1069]
14:04:08,05 Execute: ver /?
Displays the Windows version.VER
14:04:08,05 Execute: echo content !var!
content content
编辑:根据 sst 的建议,我删除了辅助函数,但为了能够使用自定义且漂亮的前缀,我决定不使用宏内的 echo on
。
关于windows - 打开批处理文件中单个命令的回显,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/58732724/