writeShellApplication not running bash script as you would expect

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So if you take a look at the script created by writeShellApplication, it uses:

set -o errexit
set -o nounset
set -o pipefail

So the script will exit if any pipe fails. Since head closes the pipe before tr could read everything from /dev/urandom, tr will return exit status 141 and the script exits.

You can either disable pipefail for that line (set +o pipefail) or add a || true.
I’d probably write it like this:

pass="$(tr -dc "$characters" < /dev/urandom | head -c "$l" || true; echo)"
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