diff --git a/.github/workflows/DNS.yml b/.github/workflows/DNS.yml
index ca6631dd..ac1937af 100644
--- a/.github/workflows/DNS.yml
+++ b/.github/workflows/DNS.yml
@@ -193,6 +193,7 @@ jobs:
         envs: 'TEST_DNS TestingDomain TEST_DNS_NO_WILDCARD TEST_DNS_NO_SUBDOMAIN TEST_DNS_SLEEP CASE TEST_LOCAL DEBUG ${{ secrets.TokenName1}} ${{ secrets.TokenName2}} ${{ secrets.TokenName3}} ${{ secrets.TokenName4}} ${{ secrets.TokenName5}}'
         prepare: pkg install -y socat curl
         usesh: true
+        copyback: false
         run: |
           if [ "${{ secrets.TokenName1}}" ] ; then
             export ${{ secrets.TokenName1}}=${{ secrets.TokenValue1}}
@@ -231,6 +232,7 @@ jobs:
     - uses: vmactions/solaris-vm@v0
       with:
         envs: 'TEST_DNS TestingDomain TEST_DNS_NO_WILDCARD TEST_DNS_NO_SUBDOMAIN TEST_DNS_SLEEP CASE TEST_LOCAL DEBUG ${{ secrets.TokenName1}} ${{ secrets.TokenName2}} ${{ secrets.TokenName3}} ${{ secrets.TokenName4}} ${{ secrets.TokenName5}}'
+        copyback: false
         prepare: pkgutil -y -i socat
         run: |
           pkg set-mediator -v -I default@1.1 openssl
@@ -275,6 +277,7 @@ jobs:
         envs: 'TEST_DNS TestingDomain TEST_DNS_NO_WILDCARD TEST_DNS_NO_SUBDOMAIN TEST_DNS_SLEEP CASE TEST_LOCAL DEBUG ${{ secrets.TokenName1}} ${{ secrets.TokenName2}} ${{ secrets.TokenName3}} ${{ secrets.TokenName4}} ${{ secrets.TokenName5}}'
         prepare: pkg_add socat curl
         usesh: true
+        copyback: false
         run: |
           if [ "${{ secrets.TokenName1}}" ] ; then
             export ${{ secrets.TokenName1}}=${{ secrets.TokenValue1}}
@@ -314,9 +317,9 @@ jobs:
       with:
         envs: 'TEST_DNS TestingDomain TEST_DNS_NO_WILDCARD TEST_DNS_NO_SUBDOMAIN TEST_DNS_SLEEP CASE TEST_LOCAL DEBUG ${{ secrets.TokenName1}} ${{ secrets.TokenName2}} ${{ secrets.TokenName3}} ${{ secrets.TokenName4}} ${{ secrets.TokenName5}}'
         prepare: |
-          export PKG_PATH="http://cdn.NetBSD.org/pub/pkgsrc/packages/NetBSD/$(uname -p)/$(uname -r|cut -f '1 2' -d.)/All/"
           pkg_add curl socat
         usesh: true
+        copyback: false
         run: |
           if [ "${{ secrets.TokenName1}}" ] ; then
             export ${{ secrets.TokenName1}}=${{ secrets.TokenValue1}}
@@ -358,6 +361,7 @@ jobs:
         prepare: |
           pkg install -y curl socat
         usesh: true
+        copyback: false
         run: |
           if [ "${{ secrets.TokenName1}}" ] ; then
             export ${{ secrets.TokenName1}}=${{ secrets.TokenValue1}}
diff --git a/.github/workflows/FreeBSD.yml b/.github/workflows/FreeBSD.yml
index 676b67c7..74b69745 100644
--- a/.github/workflows/FreeBSD.yml
+++ b/.github/workflows/FreeBSD.yml
@@ -56,6 +56,7 @@ jobs:
           "8080": "80"
         prepare: pkg install -y socat curl
         usesh: true
+        copyback: false
         run: |
           cd ../acmetest \
           && ./letest.sh
diff --git a/.github/workflows/NetBSD.yml b/.github/workflows/NetBSD.yml
index 616dfc39..84bf96b8 100644
--- a/.github/workflows/NetBSD.yml
+++ b/.github/workflows/NetBSD.yml
@@ -58,6 +58,7 @@ jobs:
           export PKG_PATH="http://cdn.NetBSD.org/pub/pkgsrc/packages/NetBSD/$(uname -p)/$(uname -r|cut -f '1 2' -d.)/All/"
           pkg_add curl socat
         usesh: true
+        copyback: false
         run: |
           cd ../acmetest \
           && ./letest.sh
diff --git a/.github/workflows/OpenBSD.yml b/.github/workflows/OpenBSD.yml
index 4f17780f..6aba1b2a 100644
--- a/.github/workflows/OpenBSD.yml
+++ b/.github/workflows/OpenBSD.yml
@@ -56,6 +56,7 @@ jobs:
           "8080": "80"
         prepare: pkg_add socat curl
         usesh: true
+        copyback: false
         run: |
           cd ../acmetest \
           && ./letest.sh
diff --git a/acme.sh b/acme.sh
index ef37f163..9ac8caf9 100755
--- a/acme.sh
+++ b/acme.sh
@@ -436,24 +436,14 @@ _secure_debug3() {
   fi
 }
 
-__USE_TR_RAW="$([ "$(echo "abc" | tr a-z A-Z 2>/dev/null)" = "ABC" ] && echo 1 || echo 0)"
-
 _upper_case() {
-  if [ "$__USE_TR_RAW" = "0" ]; then
-    tr '[:lower:]' '[:upper:]'
-  else
-    # shellcheck disable=SC2018,SC2019
-    tr 'a-z' 'A-Z'
-  fi
+  # shellcheck disable=SC2018,SC2019
+  tr '[a-z]' '[A-Z]'
 }
 
 _lower_case() {
-  if [ "$__USE_TR_RAW" = "0" ]; then
-    tr '[:upper:]' '[:lower:]'
-  else
-    # shellcheck disable=SC2018,SC2019
-    tr 'A-Z' 'a-z'
-  fi
+  # shellcheck disable=SC2018,SC2019
+  tr '[A-Z]' '[a-z]'
 }
 
 _startswith() {