diff --git a/maintainers/flake-module.nix b/maintainers/flake-module.nix
index 2d1a1bb10..c13578ec9 100644
--- a/maintainers/flake-module.nix
+++ b/maintainers/flake-module.nix
@@ -106,7 +106,6 @@
             enable = true;
             excludes = [
               # We haven't linted these files yet
-              ''^tests/functional/user-envs-test-case\.sh$''
               ''^tests/functional/user-envs\.builder\.sh$''
               ''^tests/functional/user-envs\.sh$''
               ''^tests/functional/why-depends\.sh$''
diff --git a/tests/functional/user-envs-test-case.sh b/tests/functional/user-envs-test-case.sh
index 3483a4600..9f4450161 100644
--- a/tests/functional/user-envs-test-case.sh
+++ b/tests/functional/user-envs-test-case.sh
@@ -1,14 +1,17 @@
+# shellcheck shell=bash
 clearProfiles
 
 # Query installed: should be empty.
-test "$(nix-env -p $profiles/test -q '*' | wc -l)" -eq 0
+# shellcheck disable=SC2154
+test "$(nix-env -p "$profiles"/test -q '*' | wc -l)" -eq 0
 
-nix-env --switch-profile $profiles/test
+nix-env --switch-profile "$profiles"/test
 
 # Query available: should contain several.
 test "$(nix-env -f ./user-envs.nix -qa '*' | wc -l)" -eq 6
 outPath10=$(nix-env -f ./user-envs.nix -qa --out-path --no-name '*' | grep foo-1.0)
 drvPath10=$(nix-env -f ./user-envs.nix -qa --drv-path --no-name '*' | grep foo-1.0)
+# shellcheck disable=SC2166
 [ -n "$outPath10" -a -n "$drvPath10" ]
 
 TODO_NixOS
@@ -20,18 +23,19 @@ nix-env -f ./user-envs.nix -qa --json | jq -e '.[] | select(.name == "bar-0.1")
 ] | all'
 nix-env -f ./user-envs.nix -qa --json --out-path | jq -e '.[] | select(.name == "bar-0.1") | [
     .outputName == "out",
-    (.outputs.out | test("'$NIX_STORE_DIR'.*-0\\.1"))
+    (.outputs.out | test("'"$NIX_STORE_DIR"'.*-0\\.1"))
 ] | all'
-nix-env -f ./user-envs.nix -qa --json --drv-path | jq -e '.[] | select(.name == "bar-0.1") | (.drvPath | test("'$NIX_STORE_DIR'.*-0\\.1\\.drv"))'
+nix-env -f ./user-envs.nix -qa --json --drv-path | jq -e '.[] | select(.name == "bar-0.1") | (.drvPath | test("'"$NIX_STORE_DIR"'.*-0\\.1\\.drv"))'
 
 # Query descriptions.
 nix-env -f ./user-envs.nix -qa '*' --description | grepQuiet silly
-rm -rf $HOME/.nix-defexpr
-ln -s $(pwd)/user-envs.nix $HOME/.nix-defexpr
+rm -rf "$HOME"/.nix-defexpr
+ln -s "$(pwd)"/user-envs.nix "$HOME"/.nix-defexpr
 nix-env -qa '*' --description | grepQuiet silly
 
 # Query the system.
-nix-env -qa '*' --system | grepQuiet $system
+# shellcheck disable=SC2154
+nix-env -qa '*' --system | grepQuiet "$system"
 
 # Install "foo-1.0".
 nix-env -i foo-1.0
@@ -40,7 +44,7 @@ nix-env -i foo-1.0
 # executable).
 test "$(nix-env -q '*' | wc -l)" -eq 1
 nix-env -q '*' | grepQuiet foo-1.0
-test "$($profiles/test/bin/foo)" = "foo-1.0"
+test "$("$profiles"/test/bin/foo)" = "foo-1.0"
 
 # Test nix-env -qc to compare installed against available packages, and vice versa.
 nix-env -qc '*' | grepQuiet '< 2.0'
@@ -55,6 +59,7 @@ nix-env -qas | grepQuiet -- '---  bar-0.1'
 
 # Disable foo.
 nix-env --set-flag active false foo
+# shellcheck disable=SC2235
 (! [ -e "$profiles/test/bin/foo" ])
 
 # Enable foo.
@@ -72,7 +77,7 @@ nix-env -i foo-2.0pre1
 # Query installed: should contain foo-2.0pre1 now.
 test "$(nix-env -q '*' | wc -l)" -eq 1
 nix-env -q '*' | grepQuiet foo-2.0pre1
-test "$($profiles/test/bin/foo)" = "foo-2.0pre1"
+test "$("$profiles"/test/bin/foo)" = "foo-2.0pre1"
 
 # Upgrade "foo": should install foo-2.0.
 NIX_PATH=nixpkgs=./user-envs.nix:${NIX_PATH-} nix-env -f '<nixpkgs>' -u foo
@@ -80,7 +85,7 @@ NIX_PATH=nixpkgs=./user-envs.nix:${NIX_PATH-} nix-env -f '<nixpkgs>' -u foo
 # Query installed: should contain foo-2.0 now.
 test "$(nix-env -q '*' | wc -l)" -eq 1
 nix-env -q '*' | grepQuiet foo-2.0
-test "$($profiles/test/bin/foo)" = "foo-2.0"
+test "$("$profiles"/test/bin/foo)" = "foo-2.0"
 
 # Store the path of foo-2.0.
 outPath20=$(nix-env -q --out-path --no-name '*' | grep foo-2.0)
@@ -95,9 +100,9 @@ if nix-env -q '*' | grepQuiet foo; then false; fi
 nix-env -q '*' | grepQuiet bar
 
 # Rollback: should bring "foo" back.
-oldGen="$(nix-store -q --resolve $profiles/test)"
+oldGen="$(nix-store -q --resolve "$profiles"/test)"
 nix-env --rollback
-[ "$(nix-store -q --resolve $profiles/test)" != "$oldGen" ]
+[ "$(nix-store -q --resolve "$profiles"/test)" != "$oldGen" ]
 nix-env -q '*' | grepQuiet foo-2.0
 nix-env -q '*' | grepQuiet bar
 
@@ -122,23 +127,23 @@ test "$(nix-env --list-generations | wc -l)" -eq 8
 
 # Switch to a specified generation.
 nix-env --switch-generation 7
-[ "$(nix-store -q --resolve $profiles/test)" = "$oldGen" ]
+[ "$(nix-store -q --resolve "$profiles"/test)" = "$oldGen" ]
 
 # Install foo-1.0, now using its store path.
 nix-env -i "$outPath10"
 nix-env -q '*' | grepQuiet foo-1.0
-nix-store -qR $profiles/test | grep "$outPath10"
-nix-store -q --referrers-closure $profiles/test | grep "$(nix-store -q --resolve $profiles/test)"
-[ "$(nix-store -q --deriver "$outPath10")" = $drvPath10 ]
+nix-store -qR "$profiles"/test | grep "$outPath10"
+nix-store -q --referrers-closure "$profiles"/test | grep "$(nix-store -q --resolve "$profiles"/test)"
+[ "$(nix-store -q --deriver "$outPath10")" = "$drvPath10" ]
 
 # Uninstall foo-1.0, using a symlink to its store path.
-ln -sfn $outPath10/bin/foo $TEST_ROOT/symlink
-nix-env -e $TEST_ROOT/symlink
+ln -sfn "$outPath10"/bin/foo "$TEST_ROOT"/symlink
+nix-env -e "$TEST_ROOT"/symlink
 if nix-env -q '*' | grepQuiet foo; then false; fi
-nix-store -qR $profiles/test | grepInverse "$outPath10"
+nix-store -qR "$profiles"/test | grepInverse "$outPath10"
 
 # Install foo-1.0, now using a symlink to its store path.
-nix-env -i $TEST_ROOT/symlink
+nix-env -i "$TEST_ROOT"/symlink
 nix-env -q '*' | grepQuiet foo
 
 # Delete all old generations.
@@ -148,15 +153,16 @@ nix-env --delete-generations old
 # foo-1.0.
 nix-collect-garbage
 test -e "$outPath10"
+# shellcheck disable=SC2235
 (! [ -e "$outPath20" ])
 
 # Uninstall everything
 nix-env -e '*'
-test "$(nix-env -q '*' | wc -l)" -eq 0
+test "$(nix-env -q '*' -c)" -eq 0
 
 # Installing "foo" should only install the newest foo.
 nix-env -i foo
-test "$(nix-env -q '*' | grep foo- | wc -l)" -eq 1
+test "$(nix-env -q '*' | grep foo- -c)" -eq 1
 nix-env -q '*' | grepQuiet foo-2.0
 
 # On the other hand, this should install both (and should fail due to
@@ -177,25 +183,25 @@ nix-env -q '*' | grepQuiet bar-0.1.1
 # declared priorities.
 nix-env -e '*'
 nix-env -i foo-0.1 foo-1.0
-[ "$($profiles/test/bin/foo)" = "foo-1.0" ]
+[ "$("$profiles"/test/bin/foo)" = "foo-1.0" ]
 nix-env --set-flag priority 1 foo-0.1
-[ "$($profiles/test/bin/foo)" = "foo-0.1" ]
+[ "$("$profiles"/test/bin/foo)" = "foo-0.1" ]
 
 # Priorities can be overridden with the --priority flag
 nix-env -e '*'
 nix-env -i foo-1.0
-[ "$($profiles/test/bin/foo)" = "foo-1.0" ]
+[ "$("$profiles"/test/bin/foo)" = "foo-1.0" ]
 nix-env -i --priority 1 foo-0.1
-[ "$($profiles/test/bin/foo)" = "foo-0.1" ]
+[ "$("$profiles"/test/bin/foo)" = "foo-0.1" ]
 
 # Test nix-env --set.
-nix-env --set $outPath10
-[ "$(nix-store -q --resolve $profiles/test)" = $outPath10 ]
-nix-env --set $drvPath10
-[ "$(nix-store -q --resolve $profiles/test)" = $outPath10 ]
+nix-env --set "$outPath10"
+[ "$(nix-store -q --resolve "$profiles"/test)" = "$outPath10" ]
+nix-env --set "$drvPath10"
+[ "$(nix-store -q --resolve "$profiles"/test)" = "$outPath10" ]
 
 # Test the case where $HOME contains a symlink.
-mkdir -p $TEST_ROOT/real-home/alice/.nix-defexpr/channels
-ln -sfn $TEST_ROOT/real-home $TEST_ROOT/home
-ln -sfn $(pwd)/user-envs.nix $TEST_ROOT/home/alice/.nix-defexpr/channels/foo
+mkdir -p "$TEST_ROOT"/real-home/alice/.nix-defexpr/channels
+ln -sfn "$TEST_ROOT"/real-home "$TEST_ROOT"/home
+ln -sfn "$(pwd)"/user-envs.nix "$TEST_ROOT"/home/alice/.nix-defexpr/channels/foo
 HOME=$TEST_ROOT/home/alice nix-env -i foo-0.1