Vista - Insert Header into Source Files

What would be the best method to insert a header into existing source files?
A simple method is to get-content (cat) the header and source file into a new
file. I was hoping to be able to insert the header into the existing source
files.

....
Get-ChildItem -Recurse * | foreach {
# check for directory
if (!($_.PSIsContainer))
{
# check for filename.extension format filename
if (($_.Name.Split(".")).count -eq 2)
{
$basename,$extension = $_.Name.Split(".")
# check for .c or .h files
if ($extension -eq "c" -or $extension -eq "h")
{
get-content header.txt > $newpath + $_
get-content $_ >> $newpath + $_
}
}
}
}
....

You can combine Get-Content and Set-Content to write header.txt's content and the piped file's content 'back' to the piped file, but Set-Content will really overwrite the piped file with the modified content. Note the use of the optional -Encoding parameter, by default it's set to Unicode.

Encoding acceptable values:

Name Val
---- ---
Unknown 0
String 1
Unicode 2
Byte 3
BigEndianUnicode 4
UTF8 5
UTF7 6
Ascii 7

In this example the new files' encoding will be UTF-8. First get the header's fully qualified path through Get-Item. Get child items and filter those files with a .c or .h extension. Get header content and the piped .c or .h file and overwrite the piped file through Set-Content.

$hdr = (gi header.txt).fullname
ls -r | ? {!$_.psIsContainer -and $_.extension -match '^\.[ch]$'} |
% {sc $_.fullname (gc $hdr, $_.fullname) -en 5}

--
Kiron