Removed the /tmp clean-up until the script is sorted

roles/slurm-common/templates/slurm.prolog.j2

 #!/bin/sh
 
 # echo 1 to drop page cache
-sync; echo 1 > /proc/sys/vm/drop_caches
+/bin/sync
+/bin/echo 1 > /proc/sys/vm/drop_caches
 
 exit 0