Proper way to concatenate variable strings

Question

I need to create new variable from contents of other variables  Currently I m using something like this   - command  echo     var1   -   var2   -   var3       register  newvar   The problem is    Usage of    var1         varN    brings too long strings and very ugly code  Usage of    newvar stdout    a bit better but confusing  Usage of set fact module caches fact between runs  It isn t appropriate for me    Is there any other solution

User · Answer

Since strings are lists of characters in Python, we can concatenate strings the same way we concatenate lists (with the + sign):

{{ var1 + '-' + var2 + '-' + var3 }}

If you want to pipe the resulting string to some filter, make sure you enclose the bits in parentheses:

e.g. To concatenate our 3 vars, and get a sha512 hash:

{{ (var1 + var2 + var3) | hash('sha512') }}

Note: this works on Ansible 2.3. I haven't tested it on earlier versions.

User · Answer

As simple as joining lists in python itself   ansible -m debug -a msg      -  join   list    joined    together        localhost     localhost   SUCCESS   gt       msg    list-joined-together        Works the same way using variables   ansible -m debug -a msg      -  join  var1  var2  var3       localhost

User · Answer

Good question  But I think there is no good answer which fits your criteria  The best I can think of is to use an extra vars file   A task like this   - include vars  concat yml   And in concat yml you have your definition   newvar      var1   -   var2   -   var3

[ansible] Proper way to concatenate variable strings

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