blocks|key|1623733|text|&&和%7C%7C在要实现的东西列表中(仍然是)，但没有作为下一个最有用的东西添加。原因是我们有-AND和-OR。如果你认为这很重要，请在连接上提交建议，我们将考虑V3。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1623734|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

&amp;&amp; and || were on the list of things to implement (still are) but did not pop up as the next most useful thing to add. The reason is that we have -AND and -OR.
If you think it is important, please file a suggestion on Connect and we'll consider it for V3.

blocks|key|1623739|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1623740|$errorActionPreference='Stop';+csc+/t:exe+/out:a.exe+SomeFile.cs;+a.exe|code-block|syntax|javascript|1623741|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this:

<pre><code>$errorActionPreference='Stop'; csc /t:exe /out:a.exe SomeFile.cs; a.exe
</code></pre>

blocks|key|1623948|text|如果您的命令在cmd.exe中可用(类似于python+./script.py，但不是像ii+.这样的PowerShell命令(这意味着通过Windows Explorer打开当前目录))，则可以在PowerShell中运行cmd.exe。语法如下：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1623949|cmd+/c+"command1+&&+command2"|code-block|syntax|javascript|1623950|这里，由描述in+this+question的cmd语法提供&&。|1623951|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/File_Explorer|1|https://stackoverflow.com/questions/13719174/how-to-execute-multiple-commands-in-a-single-line^0|L|I|18|4|1Y|G|0|0|0|U|2|6|G|1|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@$9|11|A|12|1|13]]|E|$]]|$1|F|3|G|5|H|7|14|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|15|8|@$9|16|A|17|B|C]]|D|@$9|18|A|19|1|1A]]|E|$]]|$1|M|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]|U|$5|P|Q|R|E|$S|V]]]]

If your command is available in cmd.exe (something like <code>python ./script.py</code>, but not PowerShell command like <code>ii .</code> (this means to open the current directory by <a href="https://en.wikipedia.org/wiki/File_Explorer" rel="nofollow noreferrer">Windows Explorer</a>)), you can run cmd.exe within PowerShell. The syntax is like this:
<pre><code>cmd /c &quot;command1 &amp;&amp; command2&quot;
</code></pre>
Here, <code>&amp;&amp;</code> is provided by cmd syntax described <a href="https://stackoverflow.com/questions/13719174/how-to-execute-multiple-commands-in-a-single-line">in this question</a>.

blocks|key|1409347|text|只需安装PowerShell+7+(go+here，然后滚动并展开assets部分)。This+release已经实现了流水线链运算符。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1409348|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/PowerShell/PowerShell/releases|1|https://docs.microsoft.com/en-us/powershell/scripting/whats-new/what-s-new-in-powershell-70?view=powershell-7^0|I|7|0|17|C|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

Just install PowerShell 7 (<a href="https://github.com/PowerShell/PowerShell/releases" rel="nofollow noreferrer">go here</a>, and scroll and expand the assets section). <a href="https://docs.microsoft.com/en-us/powershell/scripting/whats-new/what-s-new-in-powershell-70?view=powershell-7" rel="nofollow noreferrer">This release</a> has implemented the pipeline chain operators.

blocks|key|1409281|text|一个冗长的等价物是组合$LASTEXITCODE和-eq+0：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1409282|msbuild.exe+args;+if+($LASTEXITCODE+-eq+0)+{+echo+'it+built';+}+else+{+echo+'it+failed';+}|code-block|syntax|javascript|1409283|我不确定为什么if+($?)不能为我工作，但是这个可以。|1409284|entityMap^0|B|D|P|5|0|0|7|7|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|N|$]]

A verbose equivalent is to combine <code>$LASTEXITCODE</code> and <code>-eq 0</code>: 

<pre><code>msbuild.exe args; if ($LASTEXITCODE -eq 0) { echo 'it built'; } else { echo 'it failed'; }
</code></pre>

I'm not sure why <code>if ($?)</code> didn't work for me, but this one did.

blocks|key|1409126|text|使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1409127|if+(start-process+filename1.exe)+{}+else+{start-process+filename2.exe}|code-block|syntax|javascript|1409128|它比"&&“稍长一点，但它不需要编写脚本就能完成同样的事情，而且也不难记。|1409129|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Use:
<pre><code>if (start-process filename1.exe) {} else {start-process filename2.exe}
</code></pre>
It's a little longer than &quot;&amp;&amp;&quot;, but it accomplishes the same thing without scripting and is not too hard to remember.

blocks|key|1623873|text|我认为一条简单的if语句就可以做到这一点。当我看到mkelement0的响应表明最后的退出状态存储在$中时，我把以下内容放在一起：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1623874|#+Set+the+first+command+to+a+variable
$a=somecommand

#+Temporary+variable+to+store+exit+status+of+the+last+command+(since+we+can't+write+to+"$?")
$test=$?

#+Run+the+test
if+($test=$true)+{+2nd-command+}|code-block|syntax|javascript|1623875|因此，对于OP的示例，它将是：|1623876|a=(csc+/t:exe+/out:a.exe+SomeFile.cs);+$test+=+$?;+if+($test=$true)+{+a.exe+}|1623877|entityMap^0|8|2|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

I think a simple <code>if</code> statement can accomplish this. Once I saw mkelement0's response that the last exit status is stored in $?, I put the following together:
<pre><code># Set the first command to a variable
$a=somecommand

# Temporary variable to store exit status of the last command (since we can't write to &quot;$?&quot;)
$test=$?

# Run the test
if ($test=$true) { 2nd-command }
</code></pre>
So for the OP's example, it would be:
<pre><code>a=(csc /t:exe /out:a.exe SomeFile.cs); $test = $?; if ($test=$true) { a.exe }
</code></pre>

blocks|key|1408995|text|这取决于上下文，但这里有一个"-and“的实际应用示例：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1408996|get-childitem+%7C+where-object+{+$_.Name.StartsWith("f")+-and+$_.Length+-gt+10kb+}|code-block|syntax|javascript|1408997|因此，这意味着在文件名以"f“开头的目录中获取所有大于10kb的文件。|1408998|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

It depends on the context, but here's an example of "-and" in action:

<pre><code>get-childitem | where-object { $_.Name.StartsWith("f") -and $_.Length -gt 10kb }
</code></pre>

So that's getting all the files bigger than 10kb in a directory whose filename starts with "f".

blocks|key|1409150|text|我们可以尝试这个命令，而不是使用&&+method：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1409151|try+{hostname;+if+($lastexitcode+-eq+0)+{ipconfig+/all+%7C+findstr+/i+bios}}+catch+{echo+err}+finally+{}|code-block|syntax|javascript|1409152|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

We can try this command instead of using &amp;&amp; method:
<pre><code>try {hostname; if ($lastexitcode -eq 0) {ipconfig /all | findstr /i bios}} catch {echo err} finally {}
</code></pre>

<code>&amp;&amp;</code> is notoriously hard to search for on Google Search, but the best I've found is <a href="http://www.microsoft.com/technet/scriptcenter/webcasts/psweek/day4qanda.mspx" rel="noreferrer">this article</a> which says to use <code>-and</code>.
Unfortunately it doesn't give any more information, and I can't find out what I'm supposed to do with <code>-and</code> (again, a notoriously hard thing to search for).
The context I'm trying to use it in is &quot;execute cmd1, and if successful, execute cmd2&quot;, basically this:
<pre><code>csc /t:exe /out:a.exe SomeFile.cs &amp;&amp; a.exe
</code></pre>
<hr />
If you just want to run multiple commands on a single line and you don't care if the first one fails or not, you can use <code>;</code> For most of my purposes this is fine.
For example: <code>kill -n myapp; ./myapp.exe</code>.

Can I get "&&" or "-and" to work in PowerShell?

众所周知，在谷歌搜索上很难搜索到&&，但我找到的最好的是，它说要使用-and。不幸的是，它没有给出更多的信息，我也不知道我应该用-and做什么(同样，这也是出了名的难搜索的事情)。我尝试使用它的上下文是“执行cmd1，如果成功，就执行cmd2"，基本上是这样的：csc /t:exe /out:a.exe SomeFile.cs && a.exe如果您只想在一行上运行多个命令，并且不关心第一个命令是

问我能让"&&“或"-and”在PowerShell中工作吗？
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