Make src/docs/copy.sh a little more robust
#1107
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`/bin/bash` is not guaranteed to exist on all systems. Replacing the shebang with `/usr/bin/env bash` looks up the location of bash on such systems.
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/bin/bashis not guaranteed to exist on all systems. Replacing the shebang with#!/usr/bin/env bashincreases portability for these systems.Quoting arguments in bash prevents weird problems with word splitting and globbing.