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Don Burleson Blog 







The UNIX head and tail commands
Oracle Tips by Burleson Consulting


The UNIX head and tail commands

The head and tail commands operate in exactly the same fashion in UNIX and they are very useful for the Oracle DBA who wants to view only a portion of a UNIX file.

The most common use of the tail command for the Oracle DBA is monitoring a file as it becomes full. For example, during an Oracle export, you might want to monitor the new lines being added to the export log file. For this you can use the tail f command to monitor the log:

root> tail f exp_customer.log

The tail command is also useful for looking at new lines at the bottom of your Oracle alert log. For example, the following command will display the last 50 lines of the Oracle alert log:

root> tail -100 $DBA/$ORACLE_SID/bdump/alert_$ORACLE_SID.log|more

Note that output of the tail command is being piped to the more command so that you can view the alert log one page at a time..

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




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