Testing the usage of global and local variables inside and outside functions in a number of combinations

global_local_inner_outer.sh

#!/bin/sh

decl_outside="assigned outside a function"

echo "printing from outside: \$decl_outside: value before assignment INSIDE a function: [$decl_outside]"

INSIDE1() {
  echo "printing from INSIDE1(): \$decl_outside: value before assignment by INSIDE1(): [$decl_outside]"
  decl_outside="assigned by INSIDE1()"
  echo "printing from INSIDE1(): \$decl_outside: value after assignment by INSIDE1(): [$decl_outside]"
  decl_inside="assigned by INSIDE1()"
  echo "printing from INSIDE1(): \$decl_inside: value after assignment by INSIDE1(): [$decl_inside]"

  local local_decl_inside="LOCAL-assigned by INSIDE1()"
  echo "printing from INSIDE1(): \$local_decl_inside: value after LOCAL-assignment by INSIDE1(): [$local_decl_inside]"
}

INSIDE1

echo "printing from outside: \$decl_outside: value after assignment INSIDE a function: [$decl_outside]"

echo "printing from outside: \$decl_inside: value after assignment INSIDE a function: [$decl_inside]"

echo "printing from outside: \$local_decl_inside: value after LOCAL-assignment INSIDE a function: [$local_decl_inside]"

INSIDE2() {
  echo "printing from INSIDE2(): \$decl_outside: value before LOCAL-assignment by INSIDE2(): [$decl_outside]"
  local decl_outside="LOCAL-assigned by INSIDE2()"
  echo "printing from INSIDE2(): \$decl_outside: value after LOCAL-assignment by INSIDE2(): [$decl_outside]"
}

INSIDE2

echo "printing from outside: \$decl_outside: value outside a function after LOCAL-assignment INSIDE a function: [$decl_outside]"

INSIDE3() {
  local decl_outside="LOCAL-assigned by INSIDE3()"
  echo "printing from INSIDE3(): \$decl_outside: value after LOCAL-assignment by INSIDE3(): [$decl_outside]"
  unset decl_outside
  echo "printing from INSIDE3(): \$decl_outside: value after 1x UNSET INSIDE by INSIDE3(): [$decl_outside]"
}

INSIDE3

echo "printing from outside: \$decl_outside: value outside a function after 1x UNSET INSIDE a function: [$decl_outside]"

INSIDE4() {
  local decl_outside="LOCAL-assigned by INSIDE4()"
  echo "printing from INSIDE4(): \$decl_outside: value after LOCAL-assignment by INSIDE4(): [$decl_outside]"
  unset decl_outside
  echo "printing from INSIDE4(): \$decl_outside: value after 1x UNSET INSIDE by INSIDE4(): [$decl_outside]"
  unset decl_outside
  echo "printing from INSIDE4(): \$decl_outside: value after 2x UNSET INSIDE by INSIDE4(): [$decl_outside]"
}

INSIDE4

echo "printing from outside: \$decl_outside: value outside a function after 2x UNSET INSIDE a function: [$decl_outside]"

INSIDE5() {
  unset decl_outside
  echo "printing from INSIDE5(): \$decl_outside: value after 1x NONLOCAL UNSET INSIDE a function: [$decl_outside]"
}

INSIDE5

echo "printing from outside: \$decl_outside: value outside a function before 1x NONLOCAL UNSET INSIDE a function: [$decl_outside]"