# Configure crontab ## What is cron? The software utility cron is a time-based job scheduler in Unix-like computer operating systems. Users that set up and maintain software environments use cron to schedule jobs to run periodically at fixed times, dates, or intervals. In our case, we want to configure cron scheduler by editing the crontab file which controls scheduling: ``` crontab -e ``` At the bottom of the commented list that pops up, copy/paste the line below: ```bash 25 * * * * /home/cardano/cardano-node/scripts/topologyUpdater.sh ``` The picture below is an example of what you should have: ![](/files/-MBG9ZVSzyVT62VMPyPW) {% hint style="info" %} Save the changes by pressing: ctrl+o\ Then Enter exit editor: ctrl+x. {% endhint %} We are finished with setting up crontab to run our topologyUpdater.sh script at 25 mins after the hour each hour. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://topologyupdater.hivestaking.com/create-topologyupdater-logs/configure-crontab.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.