[Ferm] adding to a list

[Marc Haber]

Hi,

something like

@def $l_backexec_clients=($l_backexec_clients $host);

is becoming a rather common idiom in my ferm rules, when I add a
host's IP address to a list of hosts that is processed in a later rule.

How would I write a function that would allow me to write

@add_to_backexec_clients($host);

or

@add_to_list($l_backexec_clients,$host);

Greetings
Marc

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