link_gfortran

#!/usr/usr/bin/env bash
# This script installs the requested version of gfortran and links it to /usr/bin/gfortran
#
# Usage: bash link_gfortran

if [[ $# -lt 1 ]]; then
    printf "\nPlease provide the version of gfortran to link.\n\n"
    exit 42
fi

REQUESTED_GFORTRAN_VERSION="$1"

GFORTRAN_PATH="/usr/bin/gfortran"

REQUESTED_GFORTRAN="gfortran-""$REQUESTED_GFORTRAN_VERSION"

sudo apt update && sudo apt install "$REQUESTED_GFORTRAN"

REQUESTED_GFORTRAN_PATH="$(realpath "$(command -v "$REQUESTED_GFORTRAN")")"

if [[ -f "$GFORTRAN_PATH" ]] ; then
    sudo mv "$GFORTRAN_PATH" "$GFORTRAN_PATH".bak
fi

sudo ln -s "$REQUESTED_GFORTRAN_PATH" "$GFORTRAN_PATH"

echo "gfortran is linked to"
realpath "$(command -v gfortran)"
echo "The version of gfortran is"
gfortran --version

exit 0