The Patient List Viewer harness 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 |
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https://unix.stackexchange.com/questions/86016/how-to-install-and-use-at-job-scheduling |