List yum groups (installed, available or available environment) on yum-based systems (RHEL Redhat Fedora CentOS etc.)
#!/bin/sh
yum grouplist | sed '/^Installed Groups:/,$!d;/^Available Groups:/,$d;/^Installed Groups:/d;s/^[[:space:]]*//'
#!/bin/sh
yum grouplist | sed '/^Available Groups:/,$!d;/^Available Groups:/d;/^Done/d;s/^[[:space:]]*//'
#!/bin/sh
yum grouplist | sed '/^Installed Groups:/,$d;/^Available Environment Groups:/,$!d;/^Available Environment Groups:/d;s/^[[:space:]]*//'