say I have a file c:\test.text with the following text lines:
A B B C C D
//B A B C E D
//C B B B F G
and I want to change all lines to begin with a // except the line that begins with $myChar
what I need is to actually change the file itself (for later usage).
notes: the actual task would involve testing that use regular expressions.
I tried using Get-Content followed by ForEach-Object
that had multiple -replace staements in it and a Set-Content at the end but got wierd results like lines that got doubled or no changes happening at all.
how am I supposed to operate on the $_ ?
is the expression (of the forEach-Object ) expected to return an object or a string and how ?
I suppose I sould be able to make several changes to the same line of text but not sure how.
$line = $_
$line = $line -replace "A" "B"
does this even change the current line at all ?
can I (or should I) assign the result back to $_ ?
what is being passed to the next step of the pipeline ?
Eyal
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by: peter_fieldPosted on 2009-11-06 at 16:18:33ID: 25764267
ForEach-Object will output whatever would normally be returned on the pipeline.
i.e.
echo "abc" | foreach-object { $t = $_ }
would return nothing, because assigning a variable doesn't normally return anything. To make it return something, you would have to do something like:
echo "abc" | foreach-object { $t = $_ ; $t }
Have a look at the two samples below and see if they help you at all - if you want me to adopt this for your use case, provide some more detail of what you are trying to do.
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