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Whenever you find yourself doing grep | grep | grep | grep | grep, it's time to learn awk:

ls -ltcR $HOME | awk '!/^total/ && !/\// && !/^$/'

Experiment to see.

vnix$ n=1
vnix$ echo $($n)
bash: 1: command not found
vnix$ n="date"
vnix$ echo $($n)
Wed May 21 20:39:00 EEST 2008

So it uses the value of $n as a command. (It's the...