Can anyone explain why one pass of this loop works and then fails.
If it didn't work at all, or worked all the time I could understand, but working once and then quitting is confusing.
array=(11 12 13 14 15)
variableName='array'
for ((x=0; x<address@hidden; ++x)); do
echo "array[${x}]=${!variableName[$x]}"
done
==================
Produces:
address@hidden 01.ycc# ./tst pass3
array[0]=11
./tst: line 33: !variableName[$x]: unbound variable
--
Bill Gradwohl
if you only have integers in your array you can do this
echo "array[${x}]=$(( variableName[$x] ))"
If its not just integers its a bit more complex.
If your curious how I tend to approach this problem.
https://github.com/dethrophes/Experimental-Bash-Module-System/blob/master/bash/ArrayFuncs.sh
function check_valid_var_name
{
case "${1:?Missing Variable Name}" in
[!a-zA-Z_]* | *[!a-zA-Z_0-9]* ) return
3;;
esac
}
function get_array_element
{
check_valid_var_name "${1:?Missing Variable Name}" ||
return $?
check_valid_var_name "${2:?Missing Array Name}" ||
return $?
#echo
"${1}=\${${2}[${3:?Missing Array Index}]}"
eval "${1}"'="${'"${2}"'["${3:?Missing Array
Index}"]}"' || ErrorOut 1 "$(gettext "Error setting variable")" "${1}"
}
get_array_element TmpVar ${variableName} $x
echo "array[${x}]=${TmpVar}"
--
