与 Bash 的 `true` 命令等效的 Windows 命令外壳是什么？
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What's the Windows command shell equivalent of Bash's `true` command?
提问by Andy Stewart
I have written a Vim plugin which shells out to run external commands. Two of the commands I run are diffand grepwhich can each exit with a non-zero exit code during "normal" operation.
我写了一个 Vim 插件，它可以运行外部命令。我运行的两个命令是diff和grep在“正常”操作期间，每个命令都可以以非零退出代码退出。
(diffexits with exit code 1 when it finds differences and grepexits with exit code 1 when it doesn't find matches.)
（diff当发现差异时以退出代码 1grep退出，当未找到匹配时以退出代码 1 退出。）
For the purposes of my Vimscript I need to return an exit code of 0 from these commands. So far I'm constructing the commands like this:
为了我的 Vimscript，我需要从这些命令返回一个退出代码 0。到目前为止，我正在构建这样的命令：
diff a b || true
And:
和：
grep foo bar || true
This works for me on OS X and it apparently works for some Windows users. However, when I run Windows 7 on OS X via VirtualBox, using the Bash installed by the Git installer, I get the error message:
这在 OS X 上对我有用，并且显然对某些 Windows 用户有用。但是，当我通过 VirtualBox 在 OS X 上运行 Windows 7 时，使用 Git 安装程序安装的 Bash，我收到错误消息：
'true' is not recognized as an internal or external command, operable program or batch file.
'true' 不是内部或外部命令，也不是可运行的程序或批处理文件。
What is the correct successful-no-op command to use on Windows?
在 Windows 上使用的正确的 success-no-op 命令是什么？
采纳答案by chepner
trueis roughly equivalent to (exit 0)(the parentheses create a subshell that exits with status 0, instead of exiting your current shell.
true大致相当于(exit 0)（括号创建了一个以状态 0 退出的子 shell，而不是退出当前的 shell。
回答by user368683
VER>NUL
works for me.
对我来说有效。
For example,
例如，
MKDIR . || VER>NUL
issues an error message, but it sets %ERRORLEVEL%to 0.
发出错误消息，但它设置%ERRORLEVEL%为 0。
回答by VonC
The context is a Windows cmdshell (used by the git-cmd.batscript):
上下文是一个 Windows cmdshell（由git-cmd.bat脚本使用）：
Following "Exiting batch with EXIT /B Xwhere X>=1acts as if command completed successfully when using &&or ||operators between batch calls", you could define in your path a true.batfile with:
遵循“在批处理调用之间使用或操作符时，使用where退出批处理就像命令成功完成一样EXIT /B XX>=1&&||”，您可以在路径中定义一个true.bat文件：
@%COMSPEC% /C exit 1 >nul
回答by Peter Zagubisalo
cd .
also sets %ERRORLEVEL%to 0 but runs a bit faster and writes a bit shorter than ver>nul. Example:
也设置%ERRORLEVEL%为 0 但运行速度比ver>nul. 例子：
mkdir . 2>nul || cd .
