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Use it as bash-script.
The first positional parameter specifies the fixed length of the numerical index.
Further params specify the files to manipulate.
Opens a list of files in a text editor. Using Vim as your default editor allows you to use the power of regex substitution and visual block mode to batch rename files.
Found in the renameutils package
sudo apt-get install renameutils
Simple bash/ksh/sh command to rename all files from lower to upper case. If you want to do other stuff you can change the tr command to a sed or awk... and/or change mv to cp....
This got a bit complicated, because I had to introduce an additional dot at the end that has to be removed again later.
This command will replace all the spaces in all the filenames of the current directory with underscores. There are other commands that do this here, but this one is the easiest and shortest.