Using mapfile to save output to associative arrays - arrays

Question

In practicing bash, I tried writing a script that searches the home directory for duplicate files in the home directory and deletes them. Here's what my script looks like now.
#!/bin/bash
# create-list: create a list of regular files in a directory
declare -A arr1 sumray origray
if [[ -d "$HOME/$1" && -n "$1" ]]; then
echo "$1 is a directory"
else
echo "Usage: create-list Directory | options" >&2
exit 1
fi
for i in $HOME/$1/*; do
[[ -f $i ]] || continue
arr1[$i]="$i"
done
for i in "${arr1[#]}"; do
Name=$(sed 's/[][?*]/\\&/g' <<< "$i")
dupe=$(find ~ -name "${Name##*/}" ! -wholename "$Name")
if [[ $(find ~ -name "${Name##*/}" ! -wholename "$Name") ]]; then
mapfile -t sumray["$i"] < <(find ~ -name "${Name##*/}" ! -wholename "$Name")
origray[$i]=$(md5sum "$i" | cut -c 1-32)
fi
done
for i in "${!sumray[#]}"; do
poten=$(md5sum "$i" | cut -c 1-32)
for i in "${!origray[#]}"; do
if [[ "$poten" = "${origray[$i]}" ]]; then
echo "${sumray[$i]} is a duplicate of $i"
fi
done
done
Originally, where mapfile -t sumray["$i"] < <(find ~ -name "${Name##*/}" ! -wholename "$Name") is now, my line was the following:
sumray["$i"]=$(find ~ -name "${Name##*/}" ! -wholename "$Name")
This saved the output of find to the array. But I had an issue. If a single file had multiple duplicates, then all locations found by find would be saved to a single value. I figured I could use the mapfile command to fix this, but now it's not saving anything to my array at all. Does it have to do with the fact that I'm using an associative array? Or did I just mess up elsewhere?

Answer 1

I'm not sure if I'm allowed to answer my own question, but I figured that I should post how I solved my problem.
As it turns out, the mapfile command does not work on associative arrays at all. So my fix was to save the output of find to a text file and then store that information in an indexed array. I tested this a few times and I haven't seemed to encounter any errors yet.
Here's my finished script.
#!/bin/bash
# create-list: create a list of regular files in a directory
declare -A arr1 origray
declare indexray
#Verify that Parameter is a directory.
if [[ -d "$HOME/$1/" && -n "$1" ]]; then
echo "Searching for duplicates of files in $1"
else
echo "Usage: create-list Directory | options" >&2
exit 1
fi
#create list of files in specified directory
for i in $HOME/${1%/}/*; do
[[ -f $i ]] || continue
arr1[$i]="$i"
done
#search for all duplicate files in the home directory
#by name
#find checksum of files in specified directory
for i in "${arr1[#]}"; do
Name=$(sed 's/[][?*]/\\&/g' <<< "$i")
if [[ $(find ~ -name "${Name##*/}" ! -wholename "$Name") ]]; then
find ~ -name "${Name##*/}" ! -wholename "$Name" >> temp.txt
origray[$i]=$(md5sum "$i" | cut -c 1-32)
fi
done
#create list of duplicate file locations.
if [[ -f temp.txt ]]; then
mapfile -t indexray < temp.txt
else
echo "No duplicates were found."
exit 0
fi
#compare similarly named files by checksum and delete duplicates
count=0
for i in "${!indexray[#]}"; do
poten=$(md5sum "${indexray[$i]}" | cut -c 1-32)
for i in "${!origray[#]}"; do
if [[ "$poten" = "${origray[$i]}" ]]; then
echo "${indexray[$count]} is a duplicate of a file in $1."
fi
done
count=$((count+1))
done
rm temp.txt
This is kind of sloppy but it does what it's supposed to do. md5sum may not be the optimal way to check for file duplicates but it works. All I have to do is replace echo "${indexray[$count]} is a duplicate of a file in $1." with rm -i ${indexray[$count]} and it's good to go.
So my next question would have to be...why doesn't mapfile work with associative arrays?