bash-3.00$ ./sqlplus -h
SQL*Plus: Release 10.2.0.2.0 - Production
Copyright (c) 1982, 2005, Oracle. All Rights Reserved.
Usage 1: sqlplus -H | -V
-H Displays the SQL*Plus version and the
usage help.
-V Displays the SQL*Plus version.
Usage 2: sqlplus [ [ ---三节，就是三个部分
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