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Don Burleson Blog 







Appending data to UNIX files - re-create, re-direct, trace
Oracle Tips by Burleson Consulting

Appending data to UNIX files

UNIX provides the << and >> commands to re-direct output onto the end of an existing file. This is very useful when the Oracle DBA wants to keep logs in the UNIX environment. For example, suppose the Oracle DBA wants to add a notation to the Oracle alert log that he has just check the recent contents for errors. We could use the following command for this purpose:

echo ‘*****Alert log checked at 2/5/2002 by Don Burleson ****’ >> \

We can also use the >> command to append to an existing file of errors. Suppose we are keeping a running list of all Oracle trace file names. We could use the following command to write all new trace file name into a list. Note that the first command line uses a single “>” to re-create the trace_file_names.lst file, while subsequent re-directs use the “>>” directive to append new entries to this file.

ls –al $DBA/$ORACLE_SID/bdump/*.trc > /tmp/trace_file_names.lst
ls –al $DBA/$ORACLE_SID/udump/*.trc >> /tmp/trace_file_names.lst
ls –al $DBA/$ORACLE_SID/cdump/*.trc >> /tmp/trace_file_names.lst

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




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