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File Renaming  -- it is not a simple as it seems!
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Lots of programs are available to use...

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"mved" is a shell script basied on sed.
  https://antofthy.gitlab.io/software/#mved

    mved =.01 =

  Script works, but is a little kludgy in some situations due to the
  messy conversions into sed regular expressions.  It is however simple
  and easy to use in most situations, compared to other solutions below.

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"mv_perl"
  https://antofthy.gitlab.io/software/#mv_perl

    mv_perl 's/\.01$//' *.01

  This perl solution also allows you to apply very complex formulas...
  For example this will reformat ALL the numbers in a filename to
  width $w with leading zeros (using "sprintf()" ).

    mv_perl 's/\d+/sprintf "%0*d", $w, $&/eg'   *[0-9]*

  Many formulas are pre-defined in the command, and can be accessed by renaming
  (or symlinking) the script to matching names.  For example the above formula
  can be used if you rename (symlink) the script so it is called as "mv_renum".

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"mv_renum"
  https://antofthy.gitlab.io/software/#mv_renum

  A more controlled version to the previous perl one (above) for handling
  numbers in filenames.  Basically it will let you replace the first or last
  number in the filenames (-l for last).

  If renamed to "mv_reseq" it will resequence the numbers, with controls the
  start and increment of the numbering, and can even reverse the numerical
  order of the files.

  The script ensures than numbers do not clash or overwrite each other.  If
  there is a filename clash, it initially assumes that file will be renamed
  later, and will leave it to try again later to see if the destination file
  was renamed.  This is especially important when incrementing numbers by 1 or
  reversing the sequence.

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"rename"

  There is a perl version (ubuntu) like "mv_perl" above
    rename 's/\.01$//' *.01

  But there is also a "util-linux" version (pure string replacement)
  Which is installed on fedora and redhat machines.
    rename .01 ''  *.01

  Because of this multiple version clash, using "rename" script is NOT
  recommended.

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DIY File renaming...

A bash solution (Remove ".01" from filename...

   for i in *.01; do mv "$i" "${i%%.01}";

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For a whole directory it can be easier to create a script in vim

  ls > files.txt
  vi files.txt
    :%s/.*/mv -i & &/g
    :%s/.JPEG$/.jpg/g
    :wq
  # the resulting shell script can be visiually checked!
  bash files.txt

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vidir - edit directories and filenames

  Small program to place a numbered directory of filenames in vim.

  You can edit the filenames and on exit it will rename all files as
  you have edited, linking new names names using the reference number
  in the file.

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vim-rename

  A older directory editor like "vidir".

  https://github.com/qpkorr/vim-renamer

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Vim File Explorer

  vim {directory}

    'R' to rename
    'D  to delete

  I find it a bit clunky.

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For a single name.. you can replace the "mv" command with a bash function that
lets you edit a filename, if only one argument is given.

  function mv() {
    if [ "$#" -ne 1 ] || [ ! -e "$1" ]; then
      command mv "$@"
      return
    fi

    read -ei "$1" newfilename
    command mv -v -- "$1" "$newfilename"
  }

From
  https://www.ostechnix.com/
    bash-tips-rename-files-without-typing-full-name-twice-in-linux/

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