Create switch_cuda.sh from https://github.com/phohenecker/switch-cuda/blob/master/switch-cuda.sh

switch_cuda.sh

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+#!/usr/bin/env bash
+
+# Copyright (c) 2018 Patrick Hohenecker
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+# author:   Patrick Hohenecker <mail@paho.at>
+# version:  2018.1
+# date:     May 15, 2018
+
+
+set -e
+
+
+# ensure that the script has been sourced rather than just executed
+if [[ "${BASH_SOURCE[0]}" = "${0}" ]]; then
+    echo "Please use 'source' to execute switch-cuda.sh!"
+    exit 1
+fi
+
+INSTALL_FOLDER="/usr/local"  # the location to look for CUDA installations at
+TARGET_VERSION=${1}          # the target CUDA version to switch to (if provided)
+
+# if no version to switch to has been provided, then just print all available CUDA installations
+if [[ -z ${TARGET_VERSION} ]]; then
+    echo "The following CUDA installations have been found (in '${INSTALL_FOLDER}'):"
+    ls -l "${INSTALL_FOLDER}" | egrep -o "cuda-[0-9]+\\.[0-9]+$" | while read -r line; do
+        echo "* ${line}"
+    done
+    set +e
+    return
+# otherwise, check whether there is an installation of the requested CUDA version
+elif [[ ! -d "${INSTALL_FOLDER}/cuda-${TARGET_VERSION}" ]]; then
+    echo "No installation of CUDA ${TARGET_VERSION} has been found!"
+    set +e
+    return
+fi
+
+# the path of the installation to use
+cuda_path="${INSTALL_FOLDER}/cuda-${TARGET_VERSION}"
+
+# filter out those CUDA entries from the PATH that are not needed anymore
+path_elements=(${PATH//:/ })
+new_path="${cuda_path}/bin"
+for p in "${path_elements[@]}"; do
+    if [[ ! ${p} =~ ^${INSTALL_FOLDER}/cuda ]]; then
+        new_path="${new_path}:${p}"
+    fi
+done
+
+# filter out those CUDA entries from the LD_LIBRARY_PATH that are not needed anymore
+ld_path_elements=(${LD_LIBRARY_PATH//:/ })
+new_ld_path="${cuda_path}/lib64:${cuda_path}/extras/CUPTI/lib64"
+for p in "${ld_path_elements[@]}"; do
+    if [[ ! ${p} =~ ^${INSTALL_FOLDER}/cuda ]]; then
+        new_ld_path="${new_ld_path}:${p}"
+    fi
+done
+
+# update environment variables
+export CUDA_HOME="${cuda_path}"
+export CUDA_ROOT="${cuda_path}"
+export LD_LIBRARY_PATH="${new_ld_path}"
+export PATH="${new_path}"
+
+echo "Switched to CUDA ${TARGET_VERSION}."
+
+set +e
+return