Is there a way to add to the end of an
environment variable that is an array
without explicitly specifying the index?
eg I can do
set -Ux PATH[5] /some/path
but that means I have to actually count
how many elements the array currently has.
set -Ux PATH[-1] /some/path
will change the last element but
set -Ux PATH[-0]
gives `set: Array index out of bounds`
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