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Hi.

The command xargs can address such problems. It is found on almost every modern system. See man xargs for details, and, if you run into problems with your experiments, let us know.
...

Try this; be careful when and when NOT to use double quotes for variable expansion:
OLDIFS="$IFS"; IFS=","; for i in $a; do echo $i; done; IFS="$OLDIFS"

grep -i "search pattern'

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...