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eval ls ${exp} may be more efficient than using a new child sh,
such as ksh -c "ls $exp".

Radoulov, Much thanks for your help. :)

Hi there, In the following test, how to use shell var for pattern, regular expression. I need to accept pattern at argument, use it to pattern matching at shell script.

Test:
#!/bin/ksh
#...

At ksh, I can only close fd to 9 as your case.
But, I can do it by using Perl as the following test case.
t1.c : open 10 files
t2.pl : close fd from 3
t3.c : only wait a key to verify fds by...