Looking at this: https://stackoverflow.com/questions/5349718/how-can-i-repeat-a-character-in-bash
Another simpler candidate is:
printf '%*s' 100 | tr ' ' '-'
There is a pipe, ok, but still much fewer calls to external commands. :)
printf is already used all around, and tr seems available on OpenBSD.
Runs even in (t)csh! (this is of no use since the rest of the script won't)

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