Hi,

I had to configure a new template in order to monitor some http redirections, they should change every 24h or an alarm has to raise.

I did not find how do do this trough the web gui, I could't create a trigger to comparte the actual item text value to the one 24h ago (didn't find an easy way to compare strings),  but was able to do it via UserParameters:

UserParameter=curl.get.redirecturl.hash[*],perl -le 'print shift()/1e27' $(printf "%f\n" 0x$(curl -m 5 -sI $1 | sed -n '/^Location:/ s/^Location:\s//p' | md5sum | cut -d ' ' -f1)) 

So basically I get the URL of the redirection with curl, hash it with md5, that gives a hex number, which  is converted to decimal.

That number is too big to be stored on a item as a float, so it is divided by 1e27.

I thought that a preprocessing option to convert any text to a numeric hash value (probably using a more suitable hash function) can come very handy, as a easy way to compare strings in order to create triggers.

Thank you.