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I have about 3500 recorded phone calls and they are all labelled

yyyy_mm_dd_hh_mm_mobilenumber.3gp

I want to remove the underscore from the name so searching through them is easier

How would I do this, i.e which program or caommand is the easiest to do this.

I am using Windows 7.

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up vote 2 down vote accepted

In addition to Jacks answer: If your files are stored in subfolders, you could use this command.
In Powershell, navigate to the root folder and execute:

get-childitem -recurse -Include *.3gp | foreach { rename-item $_ $_.Name.Replace("_", "") }

If you prefer a non-command line version, you could use Rename Master

enter image description here

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|This utility is quite good, I've used rename programs before and they were so confusing and didn't even come with proper instruction. This one is great! Thumps up! – Aasim Azam Aug 15 '13 at 19:22
    
How would the script change if it was a "." instead of "_" that I wanted to remove. For eg, if the input file was "yyyy.mm.dd.hh.mm.mobilenumber.3gp". – Regmi Sep 23 '13 at 18:23

Try Powershell:

get-childItem *.3gp | rename-item -newname { $_.name -replace '_','' }
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