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xargscommand work only on file lines. Somvis only called on those values. Do you put in your question an example of file names and directories/sub-directories structure and of course an example of what do you expect. Thanksrenameutility. There are many questions with detailed answers on how to use it here on this site. It can handle any kind of renaming task, from simple sed-like filename transformations (s/old/new/) to a a complex script using any valid perl code.renameutility. But I am unable to use it via text file. I have used multiple options to rename the file using the extensions, specific pattern in the file name, replacing specific characters, finding the names in subdirectories and moving them but none of these condition apply to my query. (using a text file with an old name and new name in the file)rename, using perl'sopen()function to open thefiles.txtfile for read, then iterate over lines in the file and split each line on white-space....but for a job like this, it's probably easier to just write a perl script without using the perlrenametool. or a bash script as in my answer below.