Rename commands for migrating a macOS fileserver to Microsoft OneDrive

macos-onedrive-migration.sh

#! /usr/bin/env bash

# This is a small collection of helper commands for migrating a legacy macOS fileserver
# to OneDrive/Sharepoint. Filenames on cloud platforms are more restrictive than macOS, so
# a large number of files needed renaming before they could be synced to the Microsoft Cloud.

# 1. Use the rename CLI tool. It's installed by default on Debian/Ubuntu but needs to be
#    installed on macOS and some other platforms. More here: http://plasmasturm.org/code/rename/

brew install rename


# 2. The following transformations should be performed in order. Some commands near the top
#    are more refined versions of broader commands which appear later on, eg. slashed-dates
#    before general slash replacement. It's not perfect, but works well enough to isolate 
#    extreme edge cases. 
#
#    These commands all use the `-n` "dry-run" flag to preview what will be changed
#    To execute the command, change the flag to `-v` "verbose" or run with no flags
#
#    Note: macOS invisibly remaps slashes to colons, a leftover of the MacOS 9 filesystems.
#    Colons are otherwise forbidden in filenames on macOS, but POSIX needs to look for them

# Naive date fixes before removing the rest of the slashes
find . -depth -name '*:*' -execdir rename -n 's/(\d):(\d)/$1-$2/g' {} \;

# Replace all slashes in paths and filenames with an underscore
find . -depth -name '*:*' -execdir rename -n 's/:/_/g' {} \;

# Replace stars with bullets
find . -depth -name '*\**' -execdir rename -n 's/\*/•/g' {} \;

# Replace question marks
find . -depth -name '*\?*' -execdir rename -n 's/\?/_/g' {} \;

# Replace pipes
find . -depth -name '*\|*' -execdir rename -n 's/\|/_/g' {} \;

# Replace backslashes
find . -depth -name '*\\*' -execdir rename -n 's/\\/_/g' {} \;

# Remove trailing dots
find . -depth -name '?*.' -execdir rename -n 's/\.$//' {} \;

# Don't create dotfiles from bizarre extension-only filenames like " .png"
find -E . -depth -type f -regex '.*/ +\..*' -execdir  rename -n 's/^\s+/_/' {} \;

# Replace leading spaces on directories with '- '
find -E . -depth -type d -regex '.*/ +.*' -execdir  rename -n 's/^\s+/- /' {} \;

# Trim leading and trailing spaces
find -E . -depth -regex '.*/ +.*|.* +$' -execdir  rename -n 's/^\s*(.*?)\s*$/$1/' {} \;

Ended up not using this