Concatenate strings returned from functions in bash

Question

I'm trying to extract a version string from a text file with contains the major, minor and patch elements of the specific version.

This file is named versioninfo.txt and its contents are like the following:

MAJOR 2
MINOR 0
PATCH 0

I'm writing a bash script to extract the values from that file and generate a string like v2.0.0 but I'm struggling when building the complete version string.

This is the bash script I wrote

#!/bin/bash

function extractVersionElement() {
    line=$(sed "${1}q;d" versioninfo.txt)
    version="${line#* }"
    echo "${version}"
}

function extractVersion() {
    major="$(extractVersionElement 1)"
    minor="$(extractVersionElement 2)"
    patch="$(extractVersionElement 3)"

    echo "major: ${major}"
    echo "minor: ${minor}"
    echo "patch: ${patch}"
}

version="$(extractVersion)"
echo "$version"

Which outputs, correctly reading the single version elements:

$ ./extract_version.sh
major: 2
minor: 0
patch: 0

Changing the script to:

#!/bin/bash

function extractVersionElement() {
    line=$(sed "${1}q;d" versioninfo.txt)
    version="${line#* }"
    echo "${version}"
}

function extractVersion() {
    major="$(extractVersionElement 1)"
    minor="$(extractVersionElement 2)"
    patch="$(extractVersionElement 3)"

    # Here I try to create the complete version string
    echo "v${major}.${minor}.${patch}"
}

version="$(extractVersion)"
echo "$version"

Outputs the following, truncating the output:

$ ./extract_version.sh
.0

Any idea on how to solve this?

---

Working script

The problems were caused by \r at the end of each line. This is the working script which solves the problem:

#!/bin/bash

function extractVersionElement() {
    # read the nth line of the versioninfo file
    line=$(sed "${1}q;d" versioninfo.txt)

    # remove \r and \n from the string which were causing
    # problems when creating the final version string
    line=${line//[$'\t\r\n']}

    # extract the version after the space
    version="${line#* }"

    # return the read version
    echo "${version}"
}

function extractVersion() {
    major="$(extractVersionElement 1)"
    minor="$(extractVersionElement 2)"
    patch="$(extractVersionElement 3)"

    # combine the three version elements into one version string
    echo "v${major}.${minor}.${patch}"
}

version="$(extractVersion)"
echo "$version"