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#!/bin/bash
#
# various tests of unset when applied to variables at different local scopes
# function unsetting variable at previous local scope, uncovering global
inner()
{
unset res
echo ${FUNCNAME}: ${res-res unset}
if [[ $1 == "set" ]]; then
res[0]="X"
res[1]="Y"
fi
}
outer()
{
local res=
inner "$1"
echo ${FUNCNAME}: "res: ${res[@]}"
}
echo main: ${res-unset}
outer set
echo main: after first call: ${res-unset}
outer dontset
echo main: after second call: ${res-unset}
unset -f outer inner
unset res
# local scope, unset variable at the same scope as local declaration
func()
{
typeset x=4
unset x
echo ${FUNCNAME}: ${x:-null or unset}
}
x=outside
func
echo after func: x = $x
unset -f func
unset x
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