Josselin's questions

I would like to rename files within each sub-directory by adding the name of the sub-directory. Following the answer from Rename files by adding their parent folder name, I tried:

rename  's/(.*)\//$1\/$1_/' */*

However for lots of sub-directories it doesn't work. I have 13,000 sub-directories each containing about 300 files. I get

-bash: /usr/bin/rename:  Argument list too long

I tried:

ls | xargs rename 's/(.*)\//$1\/$1_/' */*
find . -maxdepth 1 -type f -print0 | xargs rename 's/(.*)\//$1\/$1_/' */*

Both give the same error:

-bash: /usr/bin/xargs:  Argument list too long

EDIT

xargs -L  rename 's/(.*)\//$1\/$1_/' */*
xargs -L1  rename 's/(.*)\//$1\/$1_/' */*

Same error:

-bash: /usr/bin/xargs:  Argument list too long

I have a parent directory composed of a set of sub-directories. Each sub-directory is composed of a list of files.

Here is the scenario:

v_1:
filenames.txt

v_2:
labels.txt

v_3:
coding.txt

What is my expected output?

v_1:
v_1_filenames.txt

v_2:
v_2_labels.txt

v_3:
v_3_coding.txt

What l have tried to solve that?

rename -n 's/(.*)\//$1\/$1_/' */*

which prints

rename(v_1/filenames.txt, v_1/v_1_filenames.txt)
rename(v_2/labels.txt, v_2/v_2_labels.txt)
rename(v_3/coding.txt, v_3/v_3_coding.txt)

However it doesn't work. To confirm that I did:

ls *

and I get:

v_1:
filenames.txt

v_2:
labels.txt

v_3:
coding.txt

Any cue? Thank you

l would like to display files of the following format :

train_example_X.py  

such that X varies from 1 to 9000.

What l have tried ?

ls train_example_[1-17].py

returns only train_example_1.py and train_example_7.py however l'm supposed to get all the files from 1 to 17.

and for :

ls train_example_[3605-3610].py

it returns train_example_1.py and train_example_3.py

What is wrong with my command ?