Bash text file editing/modifying

Question

I have a text file that I am trying to modify. I am taking the input file that has lines of the form of

(y+1/4,-x+1/2,z+3/4)

and trying to chan

Answer 1

Here's an approach that may simplify the parsing. Read each line into an array using IFS set to all possible delimiters and characters you don't care about:

while IFS=$'\(\)+,' read -ra line; do
    for i in 1 3 5; do
        case "${line[$i]}" in
            x) printf "%s\t%s\t%s\t" 1 0 0 ;;
            y) printf "%s\t%s\t%s\t" 0 1 0 ;;
            z) printf "%s\t%s\t%s\t" 0 0 1 ;;
            -x) printf "%s\t%s\t%s\t" -1 0 0 ;;
            -y) printf "%s\t%s\t%s\t" 0 -1 0 ;;
            -z) printf "%s\t%s\t%s\t" 0 0 -1 ;;
        esac
    done
    for i in 2 4 6; do
        printf "%s\t" "${line[$i]}"
    done
    echo
done < "$filename"