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Unix - Re-directing output to a NULL device - Cobol language, crontab
Oracle Tips by Burleson Consulting

Re-directing output to a NULL device

When we have a batch job or other Oracle task where the output is not useful, we can use the /dev/null device to suppress the output. The /dev/null device is the equivalent of the DD DUMMY syntax in the Cobol language. The /dev/null device is commonly used in schedule tasks (using the UNIX crontab utility) where the output from the command is not required. In this example, we submit a large batch job and suppress the output.

The ampersand tells UNIX to submit the job in the background, and the 2>&1 syntax tells UNIX to re-direct the standard error output to standard output. In this example, all possible output from large_file.exe will be suppressed:

./large_job.exe & 2>&1 > /dev/null

The above is an excerpt from the "Oracle9i UNIX Administration Handbook" by Oracle press, authored by Donald K. Burleson.




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