[Puppet Users] puppet exec to test if pattern exist in file

[Andrew Morgan]

I want to check if pattern exist in a file and then if it doesn;t echo  the 
pattern in the file.

class environment {

        exec{'one_run':
                path=>'/usr/bin',
                command => "echo  'PATH=$PATH:/opt/logstash/bin' >> 
/etc/profile",
                onlyif => "grep -qFx 'PATH=$PATH:/opt/logstash/bin' 
/etc/profile",
                }
}

The above doesn't work,can anyone help with this please? I want to check if 
PATH=$PATH:/opt/logstash/bin' exists in /etc/profile and if not input it 
only once.

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