Question:
I’m trying to set all svn:property’s on a set of piped files:
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dir * -include *.cs | Select-String -simplematch -pattern "HeadURL$" | select filename | svn propset svn:keywords "HeadURL Id LastChangedBy LastChangedRevision" $_ |
I get following error:
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svn: Try 'svn help' for more info svn: Explicit target required ('HeadURL Id LastChangedBy LastChangedRevision' interpreted as prop value) |
The problem is, that $_ is not passed onto svn propset…
What to do?
Answer:
For $_ to have a value you have to use it in a context where it is actually set. For your specific scenario this means that you have to wrap your call to svn into a ForEach-Object cmdlet:
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dir * -include *.cs | Select-String -simplematch -pattern "HeadURL$" | select filename | % { svn propset svn:keywords "HeadURL Id LastChangedBy LastChangedRevision" $_ } |
(I have used the % alias here for brevity)
Inside that ForEach the variable $_ has a value and can be used.
However, I have seen some uses where the current pipeline object got appended to a program’s arguments when piping into non-cmdlets. I haven’t fully understood that so far, though.
But to understand what you are doing here: You are trying to set svn:keywords on every file which uses one of those. A probably more robust and readable approach would be to actually filter the list you are scanning:
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gci * -inc *.cs | Where-Object { (Get-Content $_) -match 'HeadURL (might work, haven't tested) You can then continue by just piping that into a foreach: svn ps svn:keywords "HeadURL Id LastChangedBy LastChangedRevision" $_.FullName } |
Also, here you can access all properties of the file object and not need to rely on the object Select-String gives you.
Source:
How to pass the current powershell pipe-object "$_" as a command line arg? by stackoverflow.com licensed under CC BY-SA | With most appropriate answer!
}
(might work, haven’t tested)
You can then continue by just piping that into a foreach:
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Also, here you can access all properties of the file object and not need to rely on the object Select-String gives you.