Here's an example of logical comparisons and arithmetic in rc without them as first-class features, from a script I use to generate passwords
https://paste.sr.ht/~sircmpwn/cbe2b6c95df5d46ed8c095b03964eadcdf0d1e4a
How palatable would this be to you?
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@drewdevault
Improvement:
tr -dc '[:alnum:]' </dev/urandom | head -c 64
