Howto rename bunch of filenames which are calculated : <p>I want rename bunch of filenames. The rename is based on the calculation of the filename. That means the actual filename + 3600 = new filename.
Important is that the underscore in the pid files have to stay.</p>

<p>Thanks in advance!</p>

<p>My system is Debian Stretch.</p>

<p>Actual Filename:</p>

<pre><code>134235.error
134235_.pid
134235.tiff


13893.error
13893_.pid
13893.tiff

1.error
1_.pid
1.tiff
</code></pre>

<p>Rename to:</p>

<pre><code>137835.error
137835_.pid
137835.tiff


17493.error
17493_.pid
17493.tiff

3601.error
3601_.pid
3601.tiff
</code></pre>
