PCManFM 1.2.5 in Lubuntu 18.04 – custom command to batch rename all files in dir incl. subdir to subdir001, 002,

PCManFM 1.2.5 in Lubuntu 18.04 here.

want to add a custom command to right click menu to batch rename all files in the selected dir, including all files in all subdirs, to subdir001, subdir002, …

For example, if a directory x has subdirs abc and def containing files a1.mp3, a2.mp3, a3.mp3 each, I want the files in abc to be renamed abc001.mp3, abc002.mp3, abc003.mp3, in the same order. Same for the def dir, except to def001.mp3, etc…

How do I do this? I was searching for solutions, but they all seem to be PCManFM version dependent.

How to hide progress bars in PCManFM 1.2.5?

I am having some problem with the PCManFM on my Lubuntu 18.04LTS. The “Copying Files” progress bar always appears on top of the viewer so everytime I want to navigate through the files I need to move it out the way, it won’t let me hide it without hiding the viewer. I have my own reason that I need to search through the files while transfering files via FTP.

Since I don’t have much experience with linux I don’t know if there is any command or scripts that can do the job eventhough I would like to learn more about it. If it is just the nature of this FM I might consider changing to another lightweight one.