How to resolve the algorithm Range expansion step by step in the UNIX Shell programming language

Published on 12 May 2024 09:40 PM
#Unix shell

How to resolve the algorithm Range expansion step by step in the UNIX Shell programming language

Table of Contents

Problem Statement

A format for expressing an ordered list of integers is to use a comma separated list of either Example The list of integers: Is accurately expressed by the range expression: (And vice-versa).

Expand the range description: Note that the second element above, is the range from minus 3 to minus 1.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Range expansion step by step in the UNIX Shell programming language

Source code in the unix programming language

#!/usr/bin/bash

range_expand () (
    IFS=,
    set -- $1
    n=$#
    for element; do
        if [[ $element =~ ^(-?[0-9]+)-(-?[0-9]+)$ ]]; then
            set -- "$@" $(eval echo "{${BASH_REMATCH[1]}..${BASH_REMATCH[2]}}")
        else
            set -- "$@" $element
        fi
    done
    shift $n
    echo "$@"
    # to return a comma-separated value: echo "${*// /,}"
)

range_expand "-6,-3--1,3-5,7-11,14,15,17-20"

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