diff --git a/bin/install b/bin/install
index 9a24943..ae74822 100755
--- a/bin/install
+++ b/bin/install
@@ -52,7 +52,8 @@ asdf_yarn_v1_download() {
 }
 
 asdf_yarn_v1_install() {
-  local ASDF_YARN_DIR="$(mktemp -d -t asdf-yarn-XXXXXXX)"
+  local ASDF_YARN_DIR
+  ASDF_DATA_DIR="$(mktemp -d -t asdf-yarn-XXXXXXX)"
 
   (
     cd "${ASDF_YARN_DIR}"
@@ -82,7 +83,8 @@ asdf_yarn_v1_install() {
 }
 
 asdf_yarn_v2_plus_install() {
-  local ASDF_YARN_DIR="$(mktemp -d -t asdf-yarn-XXXXXXX)"
+  local ASDF_YARN_DIR
+  ASDF_YARN_DIR="$(mktemp -d -t asdf-yarn-XXXXXXX)"
 
   (
     cd "${ASDF_YARN_DIR}"
@@ -91,7 +93,7 @@ asdf_yarn_v2_plus_install() {
       wget -O yarn "https://repo.yarnpkg.com/${ASDF_INSTALL_VERSION}/packages/yarnpkg-cli/bin/yarn.js"
     else
       if [ -x "$(which curl)" ]; then
-        curl  -sSL -o yarn "https://repo.yarnpkg.com/${ASDF_INSTALL_VERSION}/packages/yarnpkg-cli/bin/yarn.js"
+        curl -sSL -o yarn "https://repo.yarnpkg.com/${ASDF_INSTALL_VERSION}/packages/yarnpkg-cli/bin/yarn.js"
       fi
     fi
   )
@@ -110,8 +112,9 @@ asdf_yarn_v2_plus_install() {
   mv "${ASDF_YARN_DIR}/yarn" "${ASDF_INSTALL_PATH}/bin/yarn"
 }
 
-asdf_yarn_install(){
-  local MAJOR_VERSION="$(printf %.1s $ASDF_INSTALL_VERSION)"
+asdf_yarn_install() {
+  local MAJOR_VERSION
+  MAJOR_VERSION=$(printf %.1s "$ASDF_INSTALL_VERSION")
   if [ "$MAJOR_VERSION" = "1" ]; then
     asdf_yarn_v1_install
   else
@@ -122,7 +125,7 @@ asdf_yarn_install(){
 [ "${ASDF_INSTALL_TYPE}" == 'ref' ] && asdf_yarn_fail "This plugin does not support installing by ref."
 [ -z "${ASDF_INSTALL_VERSION}" ] && asdf_yarn_fail "Unspecified install version."
 [ -z "${ASDF_INSTALL_PATH}" ] && asdf_yarn_fail "No installation directory was provided. Are you running this command via asdf? Try running 'asdf install yarn <version>'"
-[ -x "$(which wget)" -o -x "$(which curl)" ] || asdf_yarn_fail "Missing one of either of the following dependencies: wget, curl"
-[ -x "$(which tar)" -a -x "$(which gpg)" ] || asdf_yarn_fail "Missing one or more of the following dependencies: tar, gpg"
+[ -x "$(which wget)" ] || [ -x "$(which curl)" ] || asdf_yarn_fail "Missing one of either of the following dependencies: wget, curl"
+{ [ -x "$(which tar)" ] && [ -x "$(which gpg)" ]; } || asdf_yarn_fail "Missing one or more of the following dependencies: tar, gpg"
 
-asdf_yarn_install $*
+asdf_yarn_install "$@"
diff --git a/bin/list-all b/bin/list-all
index ed7b8fc..ddbffd5 100755
--- a/bin/list-all
+++ b/bin/list-all
@@ -3,17 +3,17 @@
 set -o nounset -o pipefail -o errexit
 IFS=$'\t\n'
 
-VERSIONS_CLASSIC="$(git ls-remote --refs --tags "https://github.com/yarnpkg/yarn.git" \
-| sed -E 's|^.+refs/tags/||g' \
-| grep -E '^v' \
-| sort --version-sort \
-| sed -E 's|^v||g' \
-| grep -Ev '^0\.' \
-| xargs)"
+VERSIONS_CLASSIC="$(git ls-remote --refs --tags "https://github.com/yarnpkg/yarn.git" |
+  sed -E 's|^.+refs/tags/||g' |
+  grep -E '^v' |
+  sort --version-sort |
+  sed -E 's|^v||g' |
+  grep -Ev '^0\.' |
+  xargs)"
 
-VERSIONS_BERRY="$(git ls-remote --refs --tags "https://github.com/yarnpkg/berry.git" \
-| grep '@yarnpkg/cli' \
-| sed -E 's|^.+refs/tags/@yarnpkg/cli/||g' \
-| xargs)"
+VERSIONS_BERRY="$(git ls-remote --refs --tags "https://github.com/yarnpkg/berry.git" |
+  grep '@yarnpkg/cli' |
+  sed -E 's|^.+refs/tags/@yarnpkg/cli/||g' |
+  xargs)"
 
 echo "$VERSIONS_CLASSIC $VERSIONS_BERRY"
diff --git a/bin/uninstall b/bin/uninstall
index ba16d7f..d35aee8 100755
--- a/bin/uninstall
+++ b/bin/uninstall
@@ -14,4 +14,4 @@ asdf_yarn_uninstall() {
 
 [ -z "${ASDF_INSTALL_PATH}" ] && asdf_yarn_fail "No installation directory was provided. Are you running this command via asdf? Try running 'asdf uninstall yarn <version>'"
 
-asdf_yarn_uninstall $*
+asdf_yarn_uninstall "$@"