change unzipped folder name - bash

Question

I have a fairly large number of directories (500+), each directory (and possible sub-directories) contains 4 or more zip files.
I managed to piece together a bash script that unzips the compressed files while maintaining zip filename as directory and all the directory hierarchy.
For example: If I have a zip file called 100011_test123.zip, and it contains 10 files. The script will uncompress all the files into 100011_test123/ directory.
The occurrence of numbers 100010 before the underscore in the filename/directoryname is totally random.
Here's the actual bash script:
#!/bin/bash
cd <directory-with-large-number-of-zip-files>
find . -name "*.zip" | while read filename; do unar -d -o "`dirname "$filename"`" "$filename"; done;
find . -name "*.zip" -type f -delete
Now I would like to update the script in order to remove the 100010_ from the .zip filename without tampering with the directory structure/hierarchy (I guess there's a way to rename the zip files before using unar command) and then uncompress the files into a directory without 100010_ at the beginning.
I have been stuck with this for more than 3 days. Any insights on this would be highly appreciated.
Thank you.

Answer 1

With all zip files at the same level, you don't need find, but a regular filename pattern globbing will do to iterate each zip archive.
And with bash's globstar option, you can also find the zip archives inside sub-directories
#!/usr/bin/env bash
shopt -s nullglob # Prevents iterating if no filename match
shopt -s globstar # ./**/ Allow searching inside sub-directories
# Set the basedir if you want all output directories at same place
#basedir="$PWD"
for zipfile in ./**/*.zip; do
# Extract the base directory containing the archive
zipdir="${zipfile%/*}"
# Extract the base name without the directory path
basename="${zipfile##*/}"
# Remove the .zip extension
# 100011_test123.zip -> 100011_test123
extensionless="${basename%.zip}"
# Remove everything before and first underscore 100011_
# 100011_test123 -> test123
outputdir="${basedir:-$zipdir}/${extensionless#*_}"
# Create output directory or continue with next archive
# mkdir -p test123
mkdir -p "$outputdir" || continue
# Unzip the zipfile into the outputdir and remove the zipfile if successful
# unrar -d -o test123 100011_test123.zip && rm -f -- 100011_test123.zip
unar -d -o "$outputdir" "$zipfile" && rm -f -- "$zipfile"
done

Answer 2

You need to parse directory name and filename first for each entry. Please check the ${fullpath%/*} and ${fullpath##*/} for this purpose. And awk for splitting filename with '_' and getting second part of it.
You can try following code.
#!/bin/bash
# cd directory
zip_files=($(find . -name "*.zip"))
for fullpath in "${zip_files[#]}"; do
echo "Processing: "$fullpath""
DIRNAME="${fullpath%/*}"
FILENAME="${fullpath##*/}"
NEW_FILENAME="`echo $FILENAME | awk -F'_' '{print $NF}'`"
echo " DIRNAME="$DIRNAME
echo " NEW_FILENAME="$NEW_FILENAME
mv $fullpath "$DIRNAME/$NEW_FILENAME"
# call unar command
unar -d -o $DIRNAME $NEW_FILENAME
# delete file if you want
done