Rename Filename removing end-part

Question

Hi,
I have around 200 txt files in a directory, all files have a "_" and a datestamp in the end of the filename. Is there any single-line command available that i can use to eliminate the "_" + date-part from the file names?
samples:
a1transactions_20140207.txt
b2post_20140207.txt
w32records_20140207.txt
You can see filenames are varying in number of letters in beginning, but the end-part always same which is "_yyyyMMdd". I want to remove this end-part.
After the rename, files should name like:
a1transactions.txt
b2post.txt
w32records.txt

Answer 1

Hi,
Here's one method:
$strings = 'a1transactions_20140207.txt','b2post_20140207.txt','w32records_20140207.txt'
foreach ($string in $strings) {
$fixedString = $string.SubString(0,$string.IndexOf('_')) + '.txt'
$fixedString
EDIT: This is probably more on target for what you're trying to do (sorry, didn't read the post all of the way...)
Get-ChildItem *.txt | ForEach {
$fixedString = $_.Name.SubString(0,$_.Name.IndexOf('_')) + '.txt'
Rename-Item -Path $_.FullName -NewName $fixedString
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