Check the versions of your system's locally installed Python2 and Python3

pyv.sh

#! /bin/bash
# pyv - Check the versions of the locally installed Python2 and Python3
# Created by h8rt3rmin8r on 20190127

# FUNCTION DECLARATIONS

function py2v() {
    # Check the version of the local Python2
    python2 --version &> py2v-temp
    cat py2v-temp
    rm py2v-temp
    return
}

function py3v() {
    # Check the verion of the local Python3
    python3 --version
    return
}

# VARIABLE DECLARATIONS

PY2_V="$(py2v)"
PY3_V="$(py3v)"

# EXECUTE OPERATIONS

if [[ "x$1" == "x" ]];
then
    echo "Python2 Version:   ${PY2_V}"
    echo "Python3 Version:   ${PY3_V}"
    exit 0
fi
if [[ "$1" == "2" || "$1" == "-2" || "$1" == "--python2" || "$1" == "-python2" ]];
then
    echo "${PY2_V}"
    exit 0
fi
if [[ "$1" == "3" || "$1" == "-3" || "$1" == "--python3" || "$1" == "-python3" ]];
then
    echo "${PY3_V}"
    exit 0
fi