问题
I'm getting a little frustrated on a little PowerShell script I'm writing.
Basically I loop through text files to check every line against an array of regular expression patterns. The result gets piped to the out-file cmdlet which appends it to another text file.
Get-ChildItem $logdir -Recurse -Include @('*.txt') | Get-Content | ForEach-Object {
Select-String $patterns -InputObject $_ | Out-File $csvpath -Append -Width 1000 }
My problem is that I can't get out-file to omit those additional line breaks it creates in the file behind $csvpath (three after each line). I could use .NET framework classes to achieve the same thing but I'd rather stick to pure PowerShell ;-)
Any help is greatly appreciated.
Kevin
回答1:
Why don't you use Add-Content?
gci $logdir -rec *.txt | gc | select-string $pattern | add-content $csvpath
You don't need to specify the width and -append switch, the file size is not doubled by default (although you can specify encoding) and it seems that there is no problem with the empty lines like you have.
回答2:
Keep in mind that Select-String outputs MatchInfo objects and not strings - as is shown by this command:
gci $logdir -r *.txt | gc | select-string $patterns | format-list *
You are asking for an implicit rendering of the MatchInfo object to string before being output to file. For some reason I don't understand, this is causing additional blank lines to be output. You can fix this by specifying that you only want the Line property output to the file e.g.:
gci $logdir -r *.txt | gc | select-string $patterns | %{$_.Line} |
Out-File $csvpath -append -width 1000
来源：https://stackoverflow.com/questions/2675552/avoid-line-breaks-when-using-out-file