Shell script to read input from a text file

Question

I am working on a shell script that reads input from a text file

Path1:/home/demo/path0
FILE1:test.dat,sample.txt
PATH2:/home/demo/path1
FILE2:demo1.dat,xyzb.txt
PATH3:/home/demo/path2
FILE3: samplecsv.csv,somepdf.pdf

I need output of FILE1 files test.dat, sample.txt in a separate folder, FILE2:demo1.dat,xyzb.txt file paths in separate folder.

I have tried below but not getting desired result

val=`cat filename`
Count=${#val[@]}
for (( i=0; i<$Count ; i++))
do
var=`echo ${val[i]} | sed -e 's/\.//g'`
one=$(grep PATH1 ${val[i]} | awk -F':' '{print $2}');
two=$(grep FILE1 ${val[i]} | awk -F':' '{print $2}');
done
echo $var
echo $one
echo $two

Answer 1

Notes:

1. Don't use for to read the lines of a file
2. Use $(...) instead of `...` -- see https://github.com/koalaman/shellcheck/wiki/SC2006 for more details.
3. awk can do what grep does, so you don't need both in a pipeline. However, in this scenario, you don't need either.

I would write

# so the case statement below will match case-insensitively
shopt -s nocasematch

paths=()
files=()

while IFS=: read -r key value; do
    case $key in
        PATH*) paths+=("$value") ;;
        FILE*) files+=("$value") ;;
    esac
done < filename

declare -p paths files

This outputs

declare -a paths=([0]="/home/demo/path0" [1]="/home/demo/path1" [2]="/home/demo/path2")
declare -a files=([0]="test.dat,sample.txt" [1]="demo1.dat,xyzb.txt" [2]=" samplecsv.csv,somepdf.pdf")

and you can iterate over the arrays as desired.