One solution:
To throw away any error output from grep that you don't want, change your last-but-one line to:
print `cat /etc/mail/aliases | grep $_ 2>/dev/null`;

[download]
Though you should probably find out whats actually causing the error, and fix that instead.

C.

In reply to Re: Error in converted shell script (was: Pls Help) by castaway
in thread Error in converted shell script (was: Pls Help) by Anonymous Monk

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