Totally new to programming and am trying to read a file and pattern match against user input.
I have a file named text.txt that contains the following:
------------- show mac address-table -------------
Mac Address Table
------------------------------------------------------------------
Vlan Mac Address Type Ports Moves Last Move
---- ----------- ---- ----- ----- ---------
100 1234.5678.9101 DYNAMIC Et5 10 13:13:11
Using File.read I can see the contents of the file. What I’d like to do is store the contents to a variable that I can call later to pattern match a users input.
Well, according to the documentation of File.read/1, it returns either an :ok-tuple which second element is a binary with the files content or an :error-tuple which second element explains the failure.
So it should be sufficient to simply match on the return value in a case:
case File.read(path) do
{:ok, content} -> do_something_with(content)
{:error, reason} -> # do error handling
end
There is also a pipeable version available which does return the content directly but raises on error: File.read!/1 but be careful with it.
Please take some time to reformat your initial post according to markdown rules, especially the verbatim content of your file should be enclosed in code-fences (``` on separate lines right before and after that snippet).
