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I would like to trim leading and trailing spaces from the msg field using rsyslog. I read it has functions called rtrim and ltrim but I can't find any explanation of how to use functions in RainierScript. I would really appreciate if someone can show an example of these functions. My current config is like this:

module(load="imudp") input(type="imudp" port="514" ruleset="forward") template(name="RFC5424_IP" type="string" string="<%PRI%>1 %timegenerated:::date-rfc3339% %fromhost-ip% %APP-NAME% %PROCID% %MSGID% %STRUCTURED-DATA% %msg%" ) ruleset(name="forward") { action(type="omfwd" protocol="tcp" target="127.0.0.1" port="40514" Template="RFC5424_IP" TCP_Framing="octet-counted" ) }
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You can use set to create a new json variable, typically of the same name, at the top of a tree of json values, and then refer to the variable in the template, as in the following.

template(name="RFC5424_IP" type="string" string="... %$!msg%" ) ruleset(name="forward") { set $!msg = rtrim(ltrim($msg)); action(type="omfwd" ... ) }

Don't forget the terminating semi-colon (;)! See Variable property types

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