Rename files/directories so that the first letter is upper-case on OS X

rename-first-char-to-uppercase.sh

# Assume you have a directory structure that looks something like this:

ls -alh /path/to/my/directory
drwxr-xr-x  38 jeffjohnson  staff   1.2K Jul 18 11:07 ./
drwxr-xr-x   6 jeffjohnson  staff   192B Jun 23 15:00 ../
drwxr-xr-x  10 jeffjohnson  staff   320B Aug 28  2017 foo/
drwxr-xr-x  12 jeffjohnson  staff   384B Dec 18  2017 bar/
drwxr-xr-x  11 jeffjohnson  staff   352B Feb 26  2018 baz/
-rw-r--r--   1 jeffjohnson  staff   1.8M Aug 14  2017 some-update.sql
# list continues...

# For whatever reason, you need to update the directory names so the first letter is upper-case.  The rename command is what's called for here.
# To do a dry run and see what the change will look like (without actually making the change), use the `rename` command with -n:
rename -n 's/./\U$&/' *

# Output of rename with -n:
foo renamed as Foo
bar renamed as Bar
baz renamed as Baz
some-update.sql renamed as Some-update.sql

# If you're satisfied with the preview, run the rename command without the -n:
rename 's/./\U$&/' *

# Examine the results:

ls -alh /path/to/my/directory
drwxr-xr-x  38 jeffjohnson  staff   1.2K Jul 18 11:07 ./
drwxr-xr-x   6 jeffjohnson  staff   192B Jun 23 15:00 ../
drwxr-xr-x  10 jeffjohnson  staff   320B Aug 28  2017 Foo/
drwxr-xr-x  12 jeffjohnson  staff   384B Dec 18  2017 Bar/
drwxr-xr-x  11 jeffjohnson  staff   352B Feb 26  2018 Baz/
-rw-r--r--   1 jeffjohnson  staff   1.8M Aug 14  2017 Some-update.sql

# To change from upper-case to lower-case, use the following:
rename 's/./\l$&/' *