In response to this question on using a conditional to define a TikZ style it was suggested to use /utils/exec
.
It is easy to find uses of this, but I have not been able to locate documentation on it. I have looked in the TeXbook and TeX By Topic, but did not find this.
So, where what exactly is /utils/exec
and where can I find documentation on it. Under what conditions should one use this or not use this?
pgfmanual
. You wont find such things in the TeXBook or in TeX By Topic, they list only plainTeX macros but not (La)TeX packages.