How to rename files/directories to uppercase/lowercase character names

How to rename files/directories to uppercase/lowercase character names
How to rename files/directories to upper case/lower case character names, convert the files names to lower case, convert the directories and all files in the subdirectories to upper case, convert the files names to upper case, convert the directories and all files in the subdirectories to upper case

I have created in my current working directory four files (A, B, C, D) and four directories (AA, BB, CC, DD) as follows:

$ ls -l
total 16
-rw------- 1 root wheel 0 Jun 17 10:29 A
drwx------ 2 root wheel 512 Jun 17 10:29 AA
-rw------- 1 root wheel 0 Jun 17 10:29 B
drwx------ 2 root wheel 512 Jun 17 10:29 BB
-rw------- 1 root wheel 0 Jun 17 10:29 C
drwx------ 2 root wheel 512 Jun 17 10:29 CC
-rw------- 1 root wheel 0 Jun 17 10:29 D
drwx------ 2 root wheel 512 Jun 17 10:29 DD

Now let's play a little with these upper-case names files and directories.

1) Rename all directories to lower case names

$ for i in `find . -type d`; do new_name=`echo $i | tr '[A-Z]' '[a-z]'`; mv $i $new_name ; done
$ ls -l
total 16
-rw------- 1 root wheel 0 Jun 17 10:29 A
-rw------- 1 root wheel 0 Jun 17 10:29 B
-rw------- 1 root wheel 0 Jun 17 10:29 C
-rw------- 1 root wheel 0 Jun 17 10:29 D
drwx------ 2 root wheel 512 Jun 17 10:29 aa
drwx------ 2 root wheel 512 Jun 17 10:29 bb
drwx------ 2 root wheel 512 Jun 17 10:29 cc
drwx------ 2 root wheel 512 Jun 17 10:29 dd

Above we see directories renamed in lower cased names.

2) Rename all files to lower case names

$ for i in `find . -type f`; do new_name=`echo $i | tr '[A-Z]' '[a-z]'`; mv $i $new_name ; done
$ ls -l
total 16
-rw------- 1 root wheel 0 Jun 17 10:29 a
drwx------ 2 root wheel 512 Jun 17 10:29 aa
-rw------- 1 root wheel 0 Jun 17 10:29 b
drwx------ 2 root wheel 512 Jun 17 10:29 bb
-rw------- 1 root wheel 0 Jun 17 10:29 c
drwx------ 2 root wheel 512 Jun 17 10:29 cc
-rw------- 1 root wheel 0 Jun 17 10:29 d
drwx------ 2 root wheel 512 Jun 17 10:29 dd

All files have been renamed to lower cased names.

3) Rename all files and directories to upper case names

$ for i in `find .`; do new_name=`echo $i | tr '[a-z]' '[A-Z]'`; mv $i $new_name ; done
ls -l
total 16
-rw------- 1 root wheel 0 Jun 17 10:29 A
drwx------ 2 root wheel 512 Jun 17 10:29 AA
-rw------- 1 root wheel 0 Jun 17 10:29 B
drwx------ 2 root wheel 512 Jun 17 10:29 BB
-rw------- 1 root wheel 0 Jun 17 10:29 C
drwx------ 2 root wheel 512 Jun 17 10:29 CC
-rw------- 1 root wheel 0 Jun 17 10:29 D
drwx------ 2 root wheel 512 Jun 17 10:29 DD

All files and directories have been renamed to upper cased names.

Below there's a little script that converts all upper cased files&(sub)directories to lower cased names in a path:

#!/bin/sh
DIR=/where/to/find/and/replace
for i in `find $DIR`
do
new_name=`echo $i | tr '[A-Z]' '[a-z]'`
mv $i $new_name
done

To make this little script more interesting you should play a little with the find parameters (-name, -inum -mtime -ctime, etc.). For example, if you need to rename only .EXE types of files to lower cased names, you should use find . -name *.EXE.

Also read
How to switch lower case to upper case and upper case to lower case in a string
How to convert lower case to upper case letters in a shell script/command

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4 comment(s) to How to rename files/directories to uppercase/lowercase character names:

cd to the directory you want and use find piped to xargs:
Something like the following command should rename replacing a-z with A-Z only in files (not directories) in your curent directory and subdirectories:

for i in `find . -type f`; do dir=`dirname $i`; file=`basename $i`; newfile=`echo $file | tr '[a-z]' '[A-Z]'`; mv "${dir}/${file}" "${dir}/${newfile}" ; done

Doing something like this with subdirectories from a simple script I find it a little hard (because the for loop uses subdirectories names in initial find results and changes it on the way, resulting in Xth loop not finding initial directories because their base directories were renamed in X-t loop). Hope you understand this. Contact me from my contact form if you have further questions. P.S.:
MAKE SURE TO TEST IT first !! I offer no waranty to this command.