shebang: '/usr/bin/env /path/interpreter' or '/usr/bin/env interpreter'??

README.md

Running

Notice that #2 in the 2nd example is the only one that works

1: Without user PATH

./envtest1;./envtest2;./envtest3

diff <(cat env_envtest1) <(cat env_envtest2)
diff <(cat env_envtest2) <(cat env_envtest3)

2: With user PATH

cp /bin/whoami ./bash
PATH=$(pwd):${PATH}; { ./envtest1;./envtest2;./envtest3; }
diff <(cat env_envtest1) <(cat env_envtest2)
diff <(cat env_envtest2) <(cat env_envtest3)

envtest1

#!/usr/bin/env bash
source envtestx

envtest2

#!/usr/bin/env /bin/bash
source envtestx

envtestx

echo -e "\n\nI am $0 ($*)"

logname="env_$(basename $0)"
rm -f "${logname}"

declare -a environ1
declare -a environ2
environ1=($(set))
environ2=($(env))


printf "'set': Length: %d\n" "${#environ1[@]}"
printf "'env': Length: %d\n" "${#environ2[@]}"

for each_item in "${environ1[@]}"; do
  echo -e "${each_item}" > "${logname}"
done

for each_item in "${environ2[@]}"; do
  echo -e "${each_item}" >> "${logname}"
done

ls -al env_*

gistfile1.txt

#!/bin/bash
source envtestx