How to enter a multi-line command

问题

Is it possible to split a PowerShell command line over multiple lines?

In Visual Basic I can use the underscore (_) to continue the command in the next line.

回答1:

You can use a space followed by the grave accent (backtick):

Get-ChildItem -Recurse `
  -Filter *.jpg `
  | Select LastWriteTime

However, this is only ever necessary in such cases as shown above. Usually you get automatic line continuation when a command cannot syntactically be complete at that point. This includes starting a new pipeline element:

Get-ChildItem |
  Select Name,Length

will work without problems since after the | the command cannot be complete since it's missing another pipeline element. Also opening curly braces or any other kind of parentheses will allow line continuation directly:

$x=1..5
$x[
  0,3
] | % {
  "Number: $_"
}

Similar to the | a comma will also work in some contexts:

1,
2

Keep in mind, though, similar to JavaScript's Automatic Semicolon Insertion, there are some things that are similarly broken because the line break occurs at a point where it is preceded by a valid statement:

return
  5

will not work.

Finally, strings (in all varieties) may also extend beyond a single line:

'Foo
bar'

They include the line breaks within the string, then.

回答2:

I just found out that there must not be any character between the back tick and the line break. Even whitespace will cause the command to not work.

回答3:

In most C-like languages I am deliberate about placing my braces where I think they make the code easiest to read.

PowerShell's parser recognizes when a statement clearly isn't complete, and looks to the next line. For example, imagine a cmdlet that takes an optional script block parameter:

    Get-Foo { ............ }

if the script block is very long, you might want to write:

    Get-Foo
    {
        ...............
        ...............
        ...............
    }

But this won't work: the parser will see two statements. The first is Get-Foo and the second is a script block. Instead, I write:

    Get-Foo {
        ...............
        ...............
        ...............
    }

I could use the line-continuation character (`) but that makes for hard-to-read code, and invites bugs.

Because this case requires the open brace to be on the previous line, I follow that pattern everywhere:

    if (condition) {
        .....
    }

Note that if statements require a script block in the language grammar, so the parser will look on the next line for the script block, but for consistency, I keep the open brace on the same line.

Simlarly, in the case of long pipelines, I break after the pipe character (|):

    $project.Items | 
        ? { $_.Key -eq "ProjectFile" } | 
        % { $_.Value } | 
        % { $_.EvaluatedInclude } |
        % {
            .........
        }

回答4:

To expand on cristobalito's answer:

I assume you're talking about on the command-line - if it's in a script, then a new-line >acts as a command delimiter.

On the command line, use a semi-colon ';'

For example:

Sign a PowerShell script on the command-line. No line breaks.

powershell -Command "&{$cert=Get-ChildItem –Path cert:\CurrentUser\my -codeSigningCert ; Set-AuthenticodeSignature -filepath Z:\test.ps1 -Cert $cert}

回答5:

In PowerShell and PowerShell ISE, it is also possible to use Shift + Enter at the end of each line for multiline editing (instead of standard backtick `).

回答6:

If you are trying to separate strings into multiple lines, you can use the "+". For example:

$header =    "Make," +

             "ComputerName," +

             "Model," +

             "Windows Version"

Will look just like:

$header = "Make,ComputerName,Model,Windows Version"

回答7:

I assume you're talking about on the command-line - if it's in a script, then a new-line acts as a command delimiter.

On the command line, use a semi-colon ';'

回答8:

Use a semi-colon ; to separate command
Replace double backslash \\ on any backslashes \.
Use "' for passing safe address to switch command like "'PATH'".

This ps1 command install locale pfx certificate.

powershell -Command "$pfxPassword = ConvertTo-SecureString -String "12345678" -Force -AsPlainText ; Import-PfxCertificate -FilePath "'C:\\Program Files\\VpnManagement\\resources\\assets\\cert\\localhost.pfx'" Cert:\\LocalMachine\\My -Password $pfxPassword ; Import-PfxCertificate -FilePath "'C:\\Program Files\\VpnManagement\\resources\\assets\\cert\\localhost.pfx'" Cert:\\LocalMachine\\Root -Password $pfxPassword"

回答9:

There's sooo many ways to continue a line in powershell, with pipes, brackets, parentheses, operators, dots, even with a comma. Here's a blog about it: https://get-powershellblog.blogspot.com/2017/07/bye-bye-backtick-natural-line.html

You can continue right after statements like foreach and if as well.

回答10:

$scriptBlock = [Scriptblock]::Create(@'
  echo 'before'
  ipconfig /all
  echo 'after'
'@)

Invoke-Command -ComputerName AD01 -ScriptBlock $scriptBlock

source
don't use backquote

来源：https://stackoverflow.com/questions/3235850/how-to-enter-a-multi-line-command

标签

powershell

multiline