Reversing 1-D array

Question

I'm trying to reverse a 1-D array which contains a list of files. I followed https://stackoverflow.com/questions/13360091/how-to-reverse-array-in-bash-onliner-for-loop to be the code. But this is not quite working for me.

for (( i=${#FILES_dcn[@]}-1,j=0 ;i>=0;i--,j++ ));
do
 dcnarray[j] = ${FILES_dcn[i]}
done

The values are not getting copied when I echo the arrays onto a file. Why is that??

Answer 1

If you trim the spaces around the = it will work fine:

dcnarray[j]=${FILES_dcn[i]}

Answer 2

There must be no space around = in variable assignments.

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BTW, with zsh:

dcnarray=("${(@Oa)FILES_dcn}")