Create symlinks with lowercase names from uppercase files and directories [closed] - linux

Question

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers.
This question does not appear to be about a specific programming problem, a software algorithm, or software tools primarily used by programmers. If you believe the question would be on-topic on another Stack Exchange site, you can leave a comment to explain where the question may be able to be answered.
Closed 8 years ago.
Improve this question
I have a directory that contains files and folders with names that contain uppercase letters.
I was wondering if it's possible using bash to create symlinks with the same name but in lowercase.
-rw-r--r-- 1 root root 570 Sep 22 00:00 AiA_SA_2014_08_10
-rw-r--r-- 1 root root 575 Sep 12 00:00 AiA_SA_Lite_2014_09_07
-rw-r--r-- 1 root root 570 Sep 22 00:00 AiA_SA_2014_08_10
to
-rw-r--r-- 1 root root 570 Sep 22 00:00 AiA_SA_2014_08_10
-rw-r--r-- 1 root root x Sep 22 00:00 aia_sa_2014_08_10-> AiA_SA_2014_08_10
-rw-r--r-- 1 root root 575 Sep 12 00:00 AiA_SA_Lite_2014_09_07
-rw-r--r-- 1 root root x Sep 12 00:00 aia_sa_lite_2014_09_07 -> AiA_SA_Lite_2014_09_07
-rw-r--r-- 1 root root 570 Sep 22 00:00 AiA_SA_2014_08_10
-rw-r--r-- 1 root root x Sep 22 00:00 aia_sa_2014_08_10 -> AiA_SA_2014_08_10

Answer 1

In recent bashes, you can use the ,, parameter expansion to turn a string to lowercase:
shopt -s extglob
for file in *?([:upper:])* ; do
ln -s "$file" "${file,,}"
done
The extglob pattern only selects files with an uppercase letter in their names.

Answer 2

declare -l lower
for upper in *; do lower="$upper"; ln -s "$upper" "$lower"; done

Answer 3

Yes, it's possible.
Using a simple loop:
for i in *; do
[[ -f $i ]] || continue # in case of empty directory
lcname=${i,,} # Covert the name to lowercase
ln -s "$i" "$lcname"
done
If you are not running from current directory, you can give fullpath in for loop.

Answer 4

parallel ln -s {} '{=$_=lc($_)=}' ::: *