ensure output blank line between thread stacks oldratlee#68

Author: oldratlee

show-busy-java-threads

@@ -420,15 +420,22 @@ printStackOfThreads() {
         if [ -n "$mix_native_frames" ]; then
             local sed_script="/--------------- $threadId ---------------/,/^---------------/ {
                 /--------------- $threadId ---------------/b # skip first seperator line
-                /^---------------/s/.*// # replace sencond seperator line to empty line
+                /^---------------/d # delete second seperator line
                 p
             }"
         elif [ -n "$force" ]; then
-            local sed_script="/^Thread ${threadId}:/,/^$/p"
+            local sed_script="/^Thread ${threadId}:/,/^$/ {
+                /^$/d; p # delete end seperator line
+            }"
         else
-            local sed_script="/nid=${threadId0x} /,/^$/p"
+            local sed_script="/nid=${threadId0x} /,/^$/ {
+                /^$/d; p # delete end seperator line
+            }"
         fi
-        sed "$sed_script" -n ${jstackFile} | tee ${append_file:+-a "$append_file"} ${store_dir:+-a "${store_file_prefix}$PROG"}
+        {
+            sed "$sed_script" -n ${jstackFile}
+            echo
+        } | tee ${append_file:+-a "$append_file"} ${store_dir:+-a "${store_file_prefix}$PROG"}
     done
 }