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Check this link (http://stackoverflow.com/questions/11045399/print-every-leaf-path-of-a-tree-without-recursive) as well as this one...

Using awk:

awk -F'`~' '
function from(n,pre,i,v,x)
{
if(n in T) {
v=split(T[n],x,",")
for(i=1; i<=v;i++)
from(F[x[i]], pre "~" L[x[i]]);
} else print...

As you've noted, you need to quote the string to supply a pathname containing spaces. The same still applies when you're using a variable.

cat "$(eval echo \"$line\")"Technically, the extra quotes...

eval cat \"$line\"

You can force the shell to re-evaluate a string using eval, e.g.:
cat $(eval echo $line)