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tips for using sql*plus

The result of a select statement will usually break every 10th row and insert a heading. Often, this is annoying. Example: 
select last_update from foo where rownum < 25;

LAST_UPDA                                                                       
---------                                                                       
23-JUL-01                                                                       
20-APR-01                                                                       
09-APR-01                                                                       
09-APR-01                                                                       
09-APR-01                                                                       
10-APR-01                                                                       
10-APR-01                                                                       
10-APR-01                                                                       
10-APR-01                                                                       
10-APR-01                                                                       
10-APR-01                                                                       

LAST_UPDA                                                                       
---------                                                                       
10-APR-01                                                                       
10-APR-01                                                                       
10-APR-01                                                                       
20-APR-01                                                                       
20-APR-01                                                                       
20-APR-01                                                                       
20-APR-01                                                                       
20-APR-01                                                                       
03-MAY-01                                                                       
04-MAY-01                                                                       
04-MAY-01                                                                       

LAST_UPDA                                                                       
---------                                                                       
04-MAY-01                                                                       
04-MAY-01                                                                       
04-MAY-01                                                                       
09-MAY-01
If you don't want this, use 
SET PAGESIZE 0
.