Similar to how Red Hat uses /etc/redhat-release to show you the release you are on, you can query the same thing within CoreOS.
CoreOS release information is stored in /etc/os-release
$ cat /etc/os-release NAME=CoreOS ID=coreos VERSION=444.5.0 VERSION_ID=444.5.0 BUILD_ID= PRETTY_NAME="CoreOS 444.5.0" ANSI_COLOR="1;32" HOME_URL="https://coreos.com/" BUG_REPORT_URL="https://github.com/coreos/bugs/issues"
This info will help you determine what release your on and if you’ll need to upgrade.
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