Hello, I’m discovering RouterOS scripting. I often get errors because I’m trying to add something that already exists. For instance, if I run twice a script that includes the following lines, it would fail the second time. /interface vlan add interface=bridge1 name=vlan2 vlan-id=2 How can I s…

As you know I disagree on a lot of things with rextended. The on-error here is very useful and also in general. Here because it is a typical “user pressed button twice” case. Using then :if when a value needs to be changed, if currently not as expected.

@Jotne : thanks for the citation Is there anything like “delete ifexists” like in SQL scripts ? /interface vlan # if exist, delete it remove [find where interface=bridge1 name=vlan2 vlan-id=2] # create (again) add interface=bridge1 name=vlan2 vlan-id=2 If not exist, create it, if exi…

Now you type like this, but in a while you used my method to download large files in multiple parts without a fuss, huh? :laughing:

Of course there is a definite difference between “add vlan2 and ignore the error when it already exists” and “first remove vlan2 if it exists and then add it again”. This has a totally different effect on the resulting router configuration when vlan2 already existed and had further config attached …

the “delifexist” is just for fun, to test and demostrate the power of routeros scripting, which obviously could have more power if it were better implemented… like “time” problem, missing basic functions like replace on string, etc.

Well, a definite improvement would be to have an “ignore minor errors” mode in script execution. The “on-error” clause acts upon individual blocks so it would have to be applied to every line separately (e.g. using a construct as you showed). However, in daily practice it is often very inconvenien…

Now you type like this, but in a while you used my method to download large files in multiple parts without a fuss, huh? :laughing: You just smashed your own windows.....again. It's so sad. [image] Feature request: /tool fetch HTTP-POST can send a file Scripting …

… something like “/import filename ignore-errors=yes” … This can be implemented (just for uncomplete example) using a text editor than support RegEx or the replace of “carriage return/new line”, and replacing \r\n/ with } on-error={}\r\n:do {/ on the export file before importing it, or so…

I think that would only work when /export is always used with the “terse” option, which I usually forget to do.

How to write idempotent script

RouterOS Beginner Basics

msatter February 5, 2022, 10:45am 12

You just smashed your own windows.....again. It's so sad.