diff --git a/scripts/test_linux.sh b/scripts/test_linux.sh
index 85e2999..6564bf1 100644
--- a/scripts/test_linux.sh
+++ b/scripts/test_linux.sh
@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+set -euo pipefail
 
 sudo pip3 install .
 solc-select install all
@@ -19,14 +20,14 @@ if [[ $use_version != "Switched global version to $latest_release" ]]; then
 fi
 echo "LINUX SUCCESS: maximum version"
 
-use_version=$(solc-select use 0.3.9 2>&1)
+use_version=$(solc-select use 0.3.9 2>&1 || true)
 if [[ $use_version != *"Invalid version - only solc versions above '0.4.0' are available"* ]]; then
   echo "LINUX FAILED: version too low"
   exit 255
 fi
 echo "LINUX SUCCESS: version too low"
 
-use_version=$(solc-select use 0.100.8 2>&1)
+use_version=$(solc-select use 0.100.8 2>&1 || true)
 if [[ $use_version != *"Invalid version '$latest_release' is the latest available version"* ]]; then
   echo "LINUX FAILED: version too high"
   exit 255
diff --git a/scripts/test_macos.sh b/scripts/test_macos.sh
index e1ad95b..232605e 100644
--- a/scripts/test_macos.sh
+++ b/scripts/test_macos.sh
@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+set -euo pipefail
 
 use_version=$(solc-select use 0.3.6)
 if [[ $use_version != "Switched global version to 0.3.6"* ]]; then
@@ -16,14 +17,14 @@ if [[ $use_version != "Switched global version to $latest_release" ]]; then
 fi
 echo "OS X SUCCESS: set maximum version"
 
-use_version=$(solc-select use 0.3.5 2>&1)
+use_version=$(solc-select use 0.3.5 2>&1 || true)
 if [[ $use_version != *"Invalid version - only solc versions above '0.3.6' are available"* ]]; then
   echo "OS X FAILED: version too low"
   exit 255
 fi
 echo "OS X SUCCESS: version too low"
 
-use_version=$(solc-select use 0.100.8 2>&1)
+use_version=$(solc-select use 0.100.8 2>&1 || true)
 if [[ $use_version != *"Invalid version '$latest_release' is the latest available version"* ]]; then
   echo "OS X FAILED: version too high"
   exit 255
diff --git a/scripts/test_solc.sh b/scripts/test_solc.sh
index 3b1f6c8..db20a04 100644
--- a/scripts/test_solc.sh
+++ b/scripts/test_solc.sh
@@ -1,3 +1,6 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
 ## solc 0.4.5 ##
 solc-select use 0.4.5  &> /dev/null
 solc ./scripts/solidity_tests/solc045_success.sol
@@ -8,7 +11,7 @@ if [[ $? != 0 ]]; then
 fi
 echo "SUCCESS: solc045_success"
 
-execute=$(solc ./scripts/solidity_tests/solc045_fail_compile.sol 2>&1)
+execute=$(solc ./scripts/solidity_tests/solc045_fail_compile.sol 2>&1 || true)
 if [[ "$execute" != *"Error: Expected token Semicolon got 'Function'"* ]]; then
   echo "FAILED: solc045_fail_compile"
   echo "$execute"
@@ -26,7 +29,7 @@ if [[ $? != 0 ]]; then
 fi
 echo "SUCCESS: solc050_success"
 
-execute=$(solc ./scripts/solidity_tests/solc050_fail_compile.sol 2>&1)
+execute=$(solc ./scripts/solidity_tests/solc050_fail_compile.sol 2>&1 || true)
 if [[ "$execute" != *"Error: Functions are not allowed to have the same name as the contract."* ]]; then
   echo "FAILED: solc050_fail_compile"
   exit 255
@@ -35,17 +38,14 @@ echo "SUCCESS: solc050_fail_compile"
 
 ## solc 0.6.0 ##
 solc-select use 0.6.0  &> /dev/null
-solc ./scripts/solidity_tests/solc060_success_trycatch.sol
 
-if [[ $? != 0 ]]; then
+if ! solc ./scripts/solidity_tests/solc060_success_trycatch.sol; then
   echo "FAILED: solc060_success_trycatch" $?
   exit 255
 fi
 echo "SUCCESS: solc060_success_trycatch"
 
-solc ./scripts/solidity_tests/solc060_success_receive.sol
-
-if [[ $? != 0 ]]; then
+if ! solc ./scripts/solidity_tests/solc060_success_receive.sol; then
   echo "FAILED: solc060_success_receive" $?
   exit 255
 fi
@@ -54,16 +54,14 @@ echo "SUCCESS: solc060_success_receive"
 ## solc 0.7.0 ##
 solc-select use 0.7.0  &> /dev/null
 
-execute=$(solc ./scripts/solidity_tests/solc070_fail_compile.sol 2>&1)
+execute=$(solc ./scripts/solidity_tests/solc070_fail_compile.sol 2>&1 || true)
 if [[ "$execute" != *"\"now\" has been deprecated."* ]]; then
   echo "FAILED: solc070_fail_compile" "$execute"
   exit 255
 fi
 echo "SUCCESS: solc070_fail_compile"
 
-solc ./scripts/solidity_tests/solc070_success.sol
-
-if [[ $? != 0 ]]; then
+if ! solc ./scripts/solidity_tests/solc070_success.sol; then
   echo "FAILED: solc070_success" $?
   exit 255
 fi
@@ -71,22 +69,21 @@ echo "SUCCESS: solc070_success"
 
 ## solc 0.8.0 ##
 solc-select use 0.8.0  &> /dev/null
-solc ./scripts/solidity_tests/solc080_success.sol
 
-if [[ $? != 0 ]]; then
+if ! solc ./scripts/solidity_tests/solc080_success.sol; then
   echo "FAILED: solc080_success" $?
   exit 255
 fi
 echo "SUCCESS: solc080_success"
 
-execute=$(solc ./scripts/solidity_tests/solc080_success_warning.sol 2>&1)
+execute=$(solc ./scripts/solidity_tests/solc080_success_warning.sol 2>&1 || true)
 if [[ "$execute" != *"Warning: Function state mutability can be restricted to pure"* ]]; then
   echo "FAILED: solc080_success_warning"
   exit 255
 fi
 echo "SUCCESS: solc080_success_warning"
 
-execute=$(solc ./scripts/solidity_tests/solc080_fail_compile.sol 2>&1)
+execute=$(solc ./scripts/solidity_tests/solc080_fail_compile.sol 2>&1 || true)
 if [[ "$execute" != *"Error: Explicit type conversion not allowed"* ]]; then
   echo "FAILED: solc080_fail_compile"
   exit 255
@@ -100,11 +97,11 @@ if [[ "$execute" != *"Switched global version to 0.8.9"* ]]; then
   echo "FAILED: use - always install"
   exit 255
 fi
-echo "SUCCESS:  use - always install"
+echo "SUCCESS: use - always install"
 
 UNINSTALL_PATH=$HOME/.solc-select/artifacts/solc-0.8.1
 rm -rf $UNINSTALL_PATH # uninstall solc 0.8.1
-execute=$(solc-select use 0.8.1 2>&1)
+execute=$(solc-select use 0.8.1 2>&1 || true)
 if [[ $execute != *"'0.8.1' must be installed prior to use"* ]]; then
   echo "FAILED: use - no install"
   exit 255
diff --git a/scripts/test_solc_upgrade.sh b/scripts/test_solc_upgrade.sh
index 7eac93e..de504d0 100644
--- a/scripts/test_solc_upgrade.sh
+++ b/scripts/test_solc_upgrade.sh
@@ -1,16 +1,18 @@
 #!/usr/bin/env bash
+set -euo pipefail
 
 ### Install old version of solc
-sudo pip3 uninstall solc-select
+sudo pip3 uninstall --yes solc-select
 sudo pip3 install solc-select
+solc-select use 0.8.0 --always-install
 old_solc_version=$(solc --version)
 solc-select install 0.4.11 0.5.0 0.6.12 0.7.3 0.8.3
-all_old_versions=$(solc-select versions)
+all_old_versions=$(solc-select versions | sort)
 
 ### Install new version of solc
 sudo pip3 install -e .
 new_solc_version=$(solc --version)
-all_new_versions=$(solc-select versions)
+all_new_versions=$(solc-select versions | sort)
 
 ### halt if solc version is accidentally changed
 if [ "$old_solc_version" != "$new_solc_version" ]; then
diff --git a/scripts/test_windows.sh b/scripts/test_windows.sh
index df24b12..acc284b 100644
--- a/scripts/test_windows.sh
+++ b/scripts/test_windows.sh
@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+set -euo pipefail
 
 use_version=$(solc-select use 0.4.5)
 if [[ $use_version != "Switched global version to 0.4.5"* ]]; then
@@ -16,14 +17,14 @@ if [[ $use_version != "Switched global version to $latest_release" ]]; then
 fi
 echo "WINDOWS SUCCESS: maximum version"
 
-use_version=$(solc-select use 0.3.9 2>&1)
+use_version=$(solc-select use 0.3.9 2>&1 || true)
 if [[ $use_version != *"Invalid version - only solc versions above '0.4.5' are available"* ]]; then
   echo "WINDOWS FAILED: version too low"
   exit 255
 fi
 echo "WINDOWS SUCCESS: version too low"
 
-use_version=$(solc-select use 0.100.8 2>&1)
+use_version=$(solc-select use 0.100.8 2>&1 || true)
 if [[ $use_version != *"Invalid version '$latest_release' is the latest available version"* ]]; then
   echo "WINDOWS FAILED: version too high"
   exit 255