Powershell 匹配当前行和下一行然后输出文件

Question

I'm trying to extract the data whereby:

line 1 = Report ID + Line 2 = "Machine no" + Line 3 = OFFLINE

Then Out-File to a new file.

Sample data

Report ID           page1

Machine no  1234    

        OTHERS
            12
        offline
            12
        OTHERS
            23
        offline
            37
        OTHERS
            89
        offline
            65

The result I'm looking for look something like the below after processing:

Report ID           page 4

    Machine no  1234    
        offline
            12
        offline
            37
        offline
            65

Answer 1

You can use the Select-String cmdlet with the -Context Parameter to search through a file and then select how many lines of contextual info you want to get back from your search.

For instance, if we take your input file and store it in a variable called $input like so:

$inputFile= Get-Content C:\Path\To\YourFile.txt
$inputFile| Select-string 'machine no'
>Machine no  1234  

We can then find matches for the phrase 'offline' with this:

$inputFile| Select-String offline -Context 0,1

This states that I want you to search for the word 'offline' and give me zero lines proceeding it, and one line after it, giving us this output:

>         offline
              12
>         offline
              37
>         offline
              65

We can put this all together to build this and generate a new output file that would look like this.

$out= ''
$out += $inputFile| Select-string 'machine no'
$out += "`n"
$out += $inputFile| Select-String offline -Context 0,1 | ForEach-Object {$_.Context.DisplayPostContext}

#Resulting file would look this, just the name of the machine and then the number of each offline...uh, whatever it is.
    Machine no  1234    
        12             37             65

If I were you, I'd adapt this flow to make PowerShell objects and properties instead, like this:

$Report = [pscustomobject]@{ID='';MachineNo='';OfflineMembers=@()}
$Report.ID = ($inputFile | select-string page -Context 0 ).ToString().Split('page')[-1]
$Report.MachineNo = ($inputFile | Select-string 'machine no').ToString().Trim().Split()[-1]
$Report.OfflineMembers = $inputFile | Select-String offline -Context 0,1 | ForEach-Object {
            [pscustomobject]@{Value='Offline';ID=$_.Context.DisplayPostContext.Trim()}
            }

>$Report

ID MachineNo OfflineMembers                                                             
-- --------- --------------                                                             
1 1234      {@{Value=Offline; ID=12}, @{Value=Offline; ID=37}, @{Value=Offline; ID=65}}
 $Report.OfflineMembers
Value   ID
-----   --
Offline 12
Offline 37
Offline 65