I use the below pipeline to read a file and replace a line in it and save it to another file, but found that the string in target file is not replaced, it's still the old one.
original line is : name-1a2b3c4d
new line should be: name-6a5e4r3h
(Get-Content "test1.xml") | ForEach-Object {$_ -replace '^name-.*$', "name-6a5e4r3h"} | Set-Content "test2.xml"
Anything missing there?
One thing you're missing is that the -replace operator works just fine on an array, which means you don't need that foreach-object loop at all:
(Get-Content "test1.xml") -replace '^name-.*$', 'name-6a5e4r3h' | Set-Content test2.xml
You're not changing the $_ variable.
You might try:
$lines = Get-Content $file
$len = $lines.count
for($i=0;$i-lt$len;$i++){
$lines[$i] = $lines[$i] -replace $bad, $good
}
$lines > $outfile
Related
I have a simple textfile and I need a powershell script to replace some parts of the file content.
My current script is the following:
$content = Get-Content -path "Input.json"
$content -Replace '"(\d+),(\d{1,})"', '$1.$2' | Out-File "output.json"
Is it possible to write it in one line without the content variable, like this?
Get-Content -path "Input.json" | ??? -Replace '"(\d+),(\d{1,})"', '$1.$2' | Out-File "output.json"
I don't know how I can use the output of the first get-content commandlet in the second command without the $content variable? Is there an automatic powershell variable
Is it possible to do more replacements than one in a pipeline.
Get-Content -path "Input.json" | ??? -Replace '"(\d+),(\d{1,})"', '$1.$2' | ??? -Replace 'second regex', 'second replacement' | Out-File "output.json"
Yes, you can do that in one line and don't even need a pipeline, as -replace works on arrays like you would expect it to do (and you can chain the operator):
(Get-Content Input.json) `
-replace '"(\d+),(\d{1,})"', '$1.$2' `
-replace 'second regex', 'second replacement' |
Out-File output.json
(Line breaks added for readability.)
The parentheses around the Get-Content call are necessary to prevent the -replace operator being interpreted as an argument to Get-Content.
Is it possible to write it in one line without the content variable, like this?
Yes: use ForEach-Object (or its alias %) and then $_ to reference the object on the pipeline:
Get-Content -path "Input.json" | % { $_ -Replace '"(\d+),(\d{1,})"', '$1.$2' } | Out-File "output.json"
Is it possible to do more replacements than one in a pipeline.
Yes.
As above: just adding more Foreach-Object segments.
As -replace returns the result, they can be chained in a single expression:
($_ -replace $a,$b) -replace $c,$d
I suspect the parentheses are not needed, but I think they make it easier to read: clearly
more than a few chained operators (especially if the match/replacements are non-trivial) will
not be clear.
I've searched all over including here at StackOverFlow and I cannot seem to find the solution I am needing help with. Here is my issue.
Lets say in File1.txt I have the following (no spaces between each line)
\\Serv02\LOC6\Client\726C30\032383\2200018023.pdf
\\Serv02\LOC6\Client\726C30\032383\2200718091.pdf
\\Serv02\LOC6\Client\726C30\030684\2300309040.pdf
\\Serv02\LOC6\Client\726C30\031274\2300429971.pdf
File2.txt will have the same information, however, I am needing to add a 1 right before the .pdf for each one (within file2.txt)
Example:
\\Serv02\LOC6\Client\726C30\032383\22000180231.pdf
I can easily update file2.txt using a RegEx statement, however it's only updating the contents based on that RegEx statement.
File2.txt will have a lot more data in it than file1.txt (more of the exact type of information). I am only needing to update file2.txt adding in the 1 right before .pdf BASED on what is in file1.txt
Here is the code I am using but as you can see it does not read file1.txt at all, I'm just using a RegEx statement to update file2.txt adding in the 1 before .pdf (the code below works to add in the 1 before .pdf, but I'm not iterating through file1.txt)
clear-host
set-location c:\temp
$File = "C:\Temp\file1.txt"
$FileZ = "C:\Temp\file2.txt"
$File2 = (Get-ChildItem $fileZ) | Select -ExpandProperty BaseName
$regex01 = '(\\Serv02\LOC6\Client\726C30\\d{1,6}\\d{1,10})(.pdf)$'
get-content $fileZ | % { $_ -replace $regex01, '${1}1${2}' -join "`r`n" } | out-file -Encoding default "c:\Temp\$File2.txt"
start-sleep -Seconds 2
$NewMRC = Get-ChildItem "$file2.txt" | Select -ExpandProperty Name
Get-ChildItem $NewMRC | rename-item -NewName {$_.Name -replace ".txt",".MRC2"}
If file1.txt had another line that didn't match up to the RegEx as shown above, file2.txt would not be updated with that line
\\Serv03\LOC7\Client\780D30\031456\8675309123.pdf
I hope I have explained this well enough. I'm not new to PowerShell but I am far from an expert. Any assistance is greatly appreciated.
I've modified your code as follows. The approach is read the content of File1.txt and store it in a variable. Then iterate on each line of File2.txt to check it against the regex as well as if that line is present in file1 content. If yes then replace it with whatever you want. Output this to a .tmp file in append mode. Once all the lines in File2.txt are processed, then replace it with .tmp file.
clear-host
set-location c:\temp
$File = "file1.txt"
$FileZ = "file2.txt"
# PS2
$File1 = get-content $File | Out-String
# PS3
# $File1 = get-content $File -Raw
$File2 = (Get-ChildItem $fileZ) | Select -ExpandProperty BaseName
if( test-path "$File2.tmp" ) { remove-item "$File2.tmp" }
$regex01 = '(\\\\Serv02\\LOC6\\Client\\726C30\\\d{1,6}\\\d{1,10})(.pdf)$'
get-content $fileZ |% {
$line = $_
$find = $line -replace '\\','\\'
if ( ($line -match $regex01) -AND ( $File1 -match $find ) ) {
$line -replace $regex01,'${1}1${2}' -join "`r`n"
} else {
$line
}
} | out-file "$File2.tmp" -append
remove-item "$File2.txt"
rename-item "$File2.tmp" "$File2.txt"
#start-sleep -Seconds 2
#$NewMRC = Get-ChildItem "$file2.txt" | Select -ExpandProperty Name
#Get-ChildItem $NewMRC | rename-item -NewName {$_.Name -replace ".txt",".MRC2"}
Notes:
The last 3 lines of your code doesn't seem to be related to your problem statement. So I've commented those lines.
$find = $line -replace '\\','\\': We are replacing single backslash \ with double backslash \\. But in the first parameter to -replace it must be escaped and in second param it must NOT be. So, even though they look same, they are interpreted differently.
One way to do this: Retrieve file content of first file into an array, then retrieve content of second file. For each line in second file: If first file's content has a line matching the current line, output modified line; otherwise, just output the current line.
$pattern = '(\\{2}(?:[^\\]+\\)+)([^\\\.]+)(\.pdf)'
$file1Content = Get-Content "file1.txt"
Get-Content "file2.txt" | ForEach-Object {
if ( $file1Content -contains $_ ) {
$_ | Select-String $pattern | ForEach-Object {
"{0}{1}1{2}" -f
$_.Matches[0].Groups[1].Value,
$_.Matches[0].Groups[2].Value,
$_.Matches[0].Groups[3].Value
}
}
else {
$_
}
}
First match group ($_.Matches[0].Groups[1].Value) is \\servername\sharename\path, second match group is filename without extension, and third match group is the file extension.
I have the following script which I try to run on various html files
$files = $args[0];
$string1 = $args[1];
$string2 = $args[2];
Write-Host "Replace $string1 with $string2 in $files";
gci -r -include "$files" |
foreach-object { $a = $_.fullname; ( get-content $a ) |
foreach-object {
$_ -replace "%string1" , "$string2" |
set-content $a
}
}
in an attempt to edit this line found in all the files.
<tr><td>TestCase</td></tr>
I call the script from powershell like this (it's called replace.ps1)
./replace *.html sampleTest myNewTest
but instead of changing sampleTest.html to myNewTest.html
it deletes everything in the doc except for the last line,
leaving all of the files like so:
/html
in fact, no matter what arguments I pass in this seems to happen.
Can anyone explain this/help me understand why it's happening?
Your loop structure is to blame here. You need to have the Set-Content located outside the loop. Your code is overwriting the file at every pass.
....
foreach-object { $a = $_.fullname; ( get-content $a ) |
foreach-object {
$_ -replace "$string1" , "$string2" |
} | set-content $a
}
It also might have been a typo but you had "%string1" before which, while syntactically correct, what not what you intended.
Could also have used Add-Content but that would mean you have to erase the file first. set-content $a used at the end of the pipe is more intuitive.
Your example is not one that uses regex. You could have used $_.replace($string1,$string2) with the same results.
I am trying to filter files using PowerShell, and I need to insert a new line character in between </tr><tr> to break those into separate lines and then remove all the lines that match <tr> lots of characters BTE lots of characters </tr> and save the files in place.
Forgive me, as I am new to PowerShell, and this is simple in SED, but I must use PowerShell. This is what I have but could be completely wrong.
Get-Content *.htm | Foreach-Object {$_ -replace '</tr><tr>', '</tr>\r\n<tr>'; $_}f
Get-Content *.htm | Foreach-Object {$_ -replace '<tr>.*BTE.*</tr>', ''; $_}
So it just sounds like you need to save your changes back to the original files. Also we should just be able to make these changes in one pass instead of reading the files twice.
Get-ChildItem *.htm | Foreach-Object {
$singleFileName = $_.FullName
(Get-Content $singleFileName) -replace '</tr><tr>', "</tr>`r`n<tr>" -replace '<tr>.*BTE.*</tr>' | Set-Content $singleFileName
}
You can't read and write to the same file in the pipe. We place (Get-Content $singleFileName) in parenthesis so that the whole file is read at once.
Get-Content $singleFileName | Set-Content $singleFileName
As each line is passed down the pipe the file is left open so that Set-Content can't write to it.
I don't think you have to insert the line break if RegEx is able to capture the group like this.
Get-ChildItem *.htm | Foreach-Object {
$singleFileName = $_.FullName
([RegEx]::Matches((Get-Content $singleFileName),'<tr>.*?</tr>')).Value|?{$_ -notlike '<tr>*BTE*</tr>'} | Set-Content $singleFileName
}
I am working on a code so that it find lines which has $control but should remove lines which start with * at first column
I am working with following but doesn't seem to work ..
$result = Get-Content $file.fullName | Select-String $control | Select-String -pattern "\^*" -notmatch
Thanks in advance
You're escaping the wrong character. You do not want to escape ^ as that's your anchor for "starting with". You'll want to escape the asterix, so try this:
$result = Get-Content $file.fullName | Select-String $control | select-string -pattern "^\*" -notmatch
Also, if all you want is the lines, you could also use this:
Get-Content $file.fullName | ? { $_ -match $control -and $_ -notmatch '^\*'}