referencing in files

[Jarrod Meyer]

Just a quick question, is there a way to tell a normal text file (for
instance: /etc/motd) to get a value from another file when it displays? And
what would be the syntax if this is possible? Thank you to whomever replies.
 
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If more of us valued food and cheer and song above hoarded gold, it would be
a merrier world. 
 
J. R. R. Tolkien (1892 - 1973)