The Patient List Viewer invokes the at commands to place jobs in the background. This frees up the UI while long queries are running. |
Some Linux systems do not have the at command installed. |
The ATD service is installed along with the at command. This service is required to be running for the at command to work |
Install at by using your packaged manager. For example, if you are using yum as a package manager, type in:
# yum install at |
To start the ATD services on newer systems, type in:
For older systems type in:
# /etc/init.d/atd start |
https://unix.stackexchange.com/questions/86016/how-to-install-and-use-at-job-scheduling |