generate md5sum keys for all files under targetted folder

create_md5sum_all_file.sh

#!/bin/bash

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## Bismillaahirrahmaanirrahiim..
## Allahumma sholli 'alaa sayyidinaa Muhammad..
## 
## create_md5sum_all_file.sh
## created by marjuqi r.
## august 2018
## 
#
# this script generate md5sum keys for all files under targetted folder
# recursively and then stored them on file MD5SUM_FILES_$dir_as_suffix
#
# format :
#	./create_md5sum_all_file.sh [_FULL_PATH_OF_TARGET_FOLDER_|.]
#
# 		NOTE :
# 			use dot (.) to choose current directory as a _FULL_PATH_OF_TARGET_FOLDER_
#
# example :
#	1. ./create_md5sum_all_file.sh /home/marjuqi/pdf/
#	2. ./create_md5sum_all_file.sh .
#
# output :
#	the MD5SUM file will created on your current working directory
#
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# this function convert "/home/marjuqi/Works/TOOLS/sql/" into "_home_marjuqi_Works_TOOLS_sql_"
replace_slash(){
	fullpath=$1
	result=${fullpath//\//_}
	echo $result
}

if [ $1 = "." ]; then
	fullpath=$(pwd)
else
	fullpath=$1
fi

dir_as_suffix=$(replace_slash $fullpath)
filename="MD5SUM_FILES_$dir_as_suffix"

echo "======= START ======="

n_files=$(find $fullpath -type f ! -name $filename | wc -l)
echo "======= 1. Finding all files : $n_files found.. ======="

find $fullpath -type f ! -name $filename | xargs -I{} md5sum {} > $(pwd)/$filename
echo "======= 2. Writing to file $filename.. ======="

echo "======= 3. Checking md5sum integrity.. ======="
yes "" | md5sum -c $filename

echo "======= FINISH ======="