How to get contents of file stored to parameter

I have the following relevance
parameter “Path_Name” = "{ ((pathname of parent folder of client folder of current site) & “/__NIM_Logs/”) }"
parameter “File_Name” = "mainip.txt"
wait mkdir -p {parameter “Path_Name”}
wait sh “host hostname|awk ‘{{print $NF}’ >{parameter “Path_Name”}{parameter “File_Name”}“
so now my mainip.txt file as one line in it with and ip address. I want to store that ip address to a parameter but am having no luck.
This gives a relevance sub error
parameter “IP_ADD”=”{line of file {parameter “Path_Name”}{parameter “File_Name”}}“
Command failed (Relevance substitution failed) parameter “IP_ADD”=”{line of file {parameter “Path_Name”}{parameter “File_Name”}}”

Hello!

It looks like you’re nesting relevance substitution which is not allowed

When you do { relevance } the inner statement must be valid relevance – further use of { relevance} inside like, {relevance of {relevance}} is not valid.

Try:

parameter "IP_ADD"="{line of file ((parameter "Path_Name")(parameter "File_Name"))}"