diff --git a/.github/scripts/delete-asset.sh b/.github/scripts/delete-asset.sh
index 9ccdaa8a2..4a151d4b6 100755
--- a/.github/scripts/delete-asset.sh
+++ b/.github/scripts/delete-asset.sh
@@ -5,19 +5,20 @@
 TAG_NAME=${1?}
 PATTERN=${2?}
 JSON=$(fetch_json https://api.github.com/repos/$GITHUB_REPOSITORY/releases/tags/$TAG_NAME $GITHUB_TOKEN)
-RELEASE_ID=$(echo "$JSON" | jq -r '.id')
+RELEASE_ID=$(jq -r '.id' $JSON)
+rm $JSON
 JSON=$(fetch_json https://api.github.com/repos/$GITHUB_REPOSITORY/releases/$RELEASE_ID/assets $GITHUB_TOKEN array)
-LEN=$(echo "$JSON" | jq length)
+LEN=$(jq length $JSON)
 for n in `seq 0 $(($LEN-1))`; do
-        NAME=$(echo "$JSON" | jq -r '.['$n'].name')
+        NAME=$(jq -r '.['$n'].name' "$JSON")
         if expr "$NAME" : "$PATTERN$"; then
-                ID=$(echo "$JSON" | jq '.['$n'].id')
-                TMPNAME=$(mktemp)
-                STATUS=$(curl -S -H "Authorization: token $GITHUB_TOKEN" -X DELETE "https://api.github.com/repos/$GITHUB_REPOSITORY/releases/assets/$ID" -w %{http_code} -o $TMPNAME)
-                JSON=$(cat $TMPNAME)
-                rm $TMPNAME
-                check_errors "$JSON"
+                ID=$(jq '.['$n'].id' $JSON)
+                JSON2=$(mktemp)
+                STATUS=$(curl -S -H "Authorization: token $GITHUB_TOKEN" -X DELETE "https://api.github.com/repos/$GITHUB_REPOSITORY/releases/assets/$ID" -w %{http_code} -o $JSON2)
+                check_errors "$JSON2"
                 check_status $STATUS
+                rm $JSON2
         fi
 done
+rm $JSON
 
diff --git a/.github/scripts/json-common.sh b/.github/scripts/json-common.sh
index 62b1b7565..c99193e2e 100644
--- a/.github/scripts/json-common.sh
+++ b/.github/scripts/json-common.sh
@@ -1,9 +1,9 @@
 check_errors() {
-        TYPE=$(echo "$1" | jq -r type)
+        TYPE=$(jq -r type "$1")
         if [ "$TYPE" != object ]; then
                 return
         fi
-        ERRORS=$(echo "$1" | jq -r '.errors')
+        ERRORS=$(jq -r '.errors' "$1")
         if [ "$ERRORS" != null ]; then
                 echo $ERRORS >&2
                 exit 1
@@ -11,10 +11,10 @@ check_errors() {
 }
 
 check_type() {
-        TYPE=$(echo "$1" | jq -r type)
+        TYPE=$(jq -r type "$1")
         if [ "$TYPE" != "$2" ]; then
                 echo "Wrong JSON type - expected $2, got $TYPE" >&2
-                echo "JSON: $JSON" >&2
+                echo "JSON: $(cat $1)" >&2
                 exit 1
         fi
 }
@@ -24,10 +24,8 @@ check_type() {
 ## @param $2 GITHUB_TOKEN
 ## @param $3 requested type (optional)
 fetch_json() {
-        TMPNAM=$(mktemp)
-        STATUS=$(curl -S -H "Authorization: token ${2?GitHub token is required}" -X GET ${1?URL is required} -w "%{http_code}" -o $TMPNAM)
-        JSON=$(cat $TMPNAM)
-        rm $TMPNAM
+        JSON=$(mktemp)
+        STATUS=$(curl -S -H "Authorization: token ${2?GitHub token is required}" -X GET ${1?URL is required} -w "%{http_code}" -o $JSON)
         if [ $STATUS -ne 200 ]; then
                 echo "HTTP error code $STATUS" >&2
                 echo "JSON: $JSON" >&2
@@ -46,7 +44,7 @@ check_status() {
         if [ $1 -lt 200 -o $1 -ge 300 ]; then
                 echo "Wrong response status $STATUS!" >&2
                 if [ -n ${2-""} ]; then
-                        echo "JSON: $JSON" >&2
+                        echo "JSON: $(cat $2)" >&2
                 fi
                 exit 1
         fi
diff --git a/.github/scripts/upload-asset.sh b/.github/scripts/upload-asset.sh
index 3f4e9216b..f3dc0327d 100755
--- a/.github/scripts/upload-asset.sh
+++ b/.github/scripts/upload-asset.sh
@@ -8,12 +8,11 @@ CONTENT_TYPE=${3?}
 LABEL=${4?}
 
 JSON=$(fetch_json https://api.github.com/repos/$GITHUB_REPOSITORY/releases/tags/$TAG_NAME $GITHUB_TOKEN)
-UPLOAD_URL=$(echo "$JSON" | jq -r .upload_url | sed "s/{.*}//")
+UPLOAD_URL=$(jq -r .upload_url $JSON | sed "s/{.*}//")
 
-TMPNAME=$(mktemp)
-STATUS=$(curl -S -H "Authorization: token $GITHUB_TOKEN" -H "Content-Type: $CONTENT_TYPE" -X POST "$UPLOAD_URL?name=$FILE&label=$LABEL" -T $FILE -w %{http_code} -o $TMPNAME)
-JSON=$(cat $TMPNAME)
-rm $TMPNAME
+JSON=$(mktemp)
+STATUS=$(curl -S -H "Authorization: token $GITHUB_TOKEN" -H "Content-Type: $CONTENT_TYPE" -X POST "$UPLOAD_URL?name=$FILE&label=$LABEL" -T $FILE -w %{http_code} -o $JSON)
 check_errors "$JSON"
 check_status $STATUS
+rm $JSON
 
diff --git a/.github/workflows/ccpp.yml b/.github/workflows/ccpp.yml
index 4ea66ef78..9be56c946 100644
--- a/.github/workflows/ccpp.yml
+++ b/.github/workflows/ccpp.yml
@@ -51,7 +51,7 @@ jobs:
         curl -H "Authorization: token $GITHUB_TOKEN" -X $REQ $URL -T - <<EOF
         {
           "tag_name": "continuous", "name": "continuous builds",
-          "body": "Last update at $DATE\n\nCurrent builds from Git master branch. Linux ARM and macOS alternative builds are rebuilt daily. Archived builds can be found [here](https://frakira.fi.muni.cz/~xpulec/ug-nightly-archive/).",
+          "body": "Last update $DATE\n\nCurrent builds from Git master branch. Linux ARM and macOS alternative builds are rebuilt daily. Archived builds can be found [here](https://frakira.fi.muni.cz/~xpulec/ug-nightly-archive/).",
           "draft": false, "prerelease": true
         }
         EOF