Breakdown a string into two arrays using awk/sed/grep - bash

Question

Create two different arrays in shell/bash script from content in a text file which has details about different files. How do I extract directories into one array and filenames to another array, using awk/sed/grep?
I have a text file as show below
2017-02-04 07:18 /temp/folder1/filename_20170204_something.txt
2017-03-04 07:18 /temp/folder2/filename_20170204_20170304.txt
2017-04-04 07:18 /temp/folder3/filename_20170404_.txt
directories_list= {folder1,folder2,folder3}
file_list = {filename_20170204.txt,filename_20170304.txt,filename_20170404.txt}

Answer 1

I would use awk to split the lines into columns, then print the column number for the folder and the column number for the file. You can tell awk what the delimiting character is with the -F option.
This script stores the folders in one array and the files in another.
#!/bin/bash
FOLDERS=() # declares FOLDERS as an array
FILES=() # declares FILES as an array
INPUT=input.txt # change to the path of your data file
while read LINE
do
FOLDER=$(echo $LINE | awk -F / '{print $3}')
FILE=$(echo $LINE | awk -F / '{print $4}')
echo "Reading next line..."
echo FOLDER: $FOLDER
echo FILE: $FILE
echo ""
FOLDERS+=( "$FOLDER" ) # appends $FOLDERS to the FOLDERS array
FILES+=( "$FILE" ) # appends $FILE to FILES array
done < $INPUT
# Now the FOLDERS array and FILES array have what you want
echo FOLDERS array: ${FOLDERS[#]}
echo FILES array: ${FILES[#]}
That's assuming you have the input.txt file in the same directory and it contains your sample data.

Answer 2

Read the file line by line, split with read and IFK, use basename and dirname, and read in the array:
cat <<EOF >file
2017-02-04 07:18 /temp/folder1/filename_20170204_something.txt
2017-03-04 07:18 /temp/folder2/filename_20170204_20170304.txt
2017-04-04 07:18 /temp/folder3/filename_20170404_.txt
EOF
dirs=() files=()
while IFS=' ' read -r _ _ path; do
dirs+=("$(basename "$(dirname "$path")")")
files+=("$(basename "$path")")
done <file
declare -p dirs files

Answer 3

How do you want to handle the duplicate entries in the array & is there any specific order that you want to save the files.
If not you can use the below commands, (removes duplicate entries & sorts based on filenames)
folders=()
files=()
folders=`awk '{print $NF}' <INPUT_FILE> | awk -F'/' '{print $(NF-1)}' | sort -nr | uniq`
files=`awk '{print $NF}' <INPUT_FILE> | awk -F'/' '{print $NF}' | sort -nr | uniq`
Below is the explanation for the awk commands,
awk '{print $NF}' <INPUT_FILE> -> takes the last field in the input file
awk -F'/' '{print $(NF-1)}' -> cuts the last filed with / as delimiter and takes the penultimate column
Hope this helps !