The key to your problem is 'interpolation'. The code that the Perl interpreter sees is:

print 2007-08-05;

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which is some arithmetic (2007 - 08 - 05) containing two octal constants and a decimal constant. You need to quote the interpolated date so that the interpreter sees a string instead:

@Discon=$telnet->cmd("cat /data/pinpe.csv | nawk '{print \$4}' | perl 
+-ne 'print if \$_ lt \'$DATE[0]\''");

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DWIM is Perl's answer to Gödel

In reply to Re: extract a log file to filter previous dates by GrandFather
in thread extract a log file to filter previous dates by pinpe

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