Re: Replace lines in a text file?
- From: "Craigie" <Craigie@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 14 Dec 2005 04:36:03 -0800
This is great Bruce what if i have other characters in the way e.g. i wan to
replace
<add key="Prime.Global.WebSuperVisorRole" value="webfarm\ACCESS_SUPS"/>
<add key="Prime.Global.WebSuperVisorRole" value="rex\ACCESS_SUPS"/>
Craig
"Bruce Payette [MSFT]" wrote:
> If you're using msh here's a quick way to do what Crash suggested. Say you
> want to turn every instance of "href" into "HREF" in a file named
> "file.htm". The following script will do that:
>
> $data = (get-content file.htm) -replace "href","HREF"; $data >
> file.htm
>
> This example loads the entire script into memory at once so you probably
> don't want to use it process huge scripts. The other way to do this is to
> use a temp file. That solution would look like:
>
> get-content file.htm | foreach { $_ -replace "href","HREF" } > temp.htm
> move-item -force temp.htm file.htm
>
> The first line writes the transformed file into temp.htm and the second line
> renames temp.htm to file.htm, overwriting the existing file.
>
> --
> Bruce Payette [MSFT]
> Microsoft Command Shell Development
> Microsoft Corporation
> This posting is provided "AS IS" with no warranties, and confers no rights.
>
>
> ""Crash" Dummy" <dvader@xxxxxxxxxxxxx> wrote in message
> news:e%23rLl7v7FHA.3976@xxxxxxxxxxxxxxxxxxxxxxx
> >> I am needing to read a text file, more specifically a certain line (let's
> >> just say line 4) of the text file, match it against a pattern using an IF
> >> THEN statement, and if it does not match the pattern I need to replace
> >> that
> >> line with a set string. I am familiar with opening and closing, read and
> >> writing to text files, but I cannot find a solution for line replacement.
> >
> > That's because there isn't one. You can't edit files in situ.
> >
> >> I also know that you cannot simultaneously write to a file while it is
> >> open
> >> for a read. Is there a solution to this?
> >
> > The only solution to this is either to read the whole file, close it, and
> > reopen
> > it for writing, or create a new file for writing.
> >
> > For your particular situation, there are a couple of ways to go at it,
> > depending
> > on how big the file you want to edit is. If it is small, you can load the
> > whole
> > file, edit the line in question, then write it back to the file. If the
> > file is
> > large, you read it one line at a time, edit the line or lines you want,
> > and
> > write back to a temporary file. When you are done, delete the original and
> > rename the temp to the original name.
> > --
> > Crash
> >
> >
> >
>
>
>
.
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