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[root@mip blog]# cat TR_file
Sun Jan 2 07:42:56 2000
Database mounted in Exclusive Mode
Completed: ALTER DATABASE MOUNT
Sun Jan 2 07:42:56 2000
Database tested in Exclusive Mode
Completed: ALTER DATABASE MOUNT
abc Jan 2 12:42:56 2000
Database mounted in Exclusive Mode
Completed: ALTER DATABASE MOUNT
Sun Jan 2 23:00:00 2009
Database mounted in Exclusive Mode
Completed: ALTER DATABASE MOUNT
[root@mip blog]# awk -v RS='[[:alpha:]]+ [[:alpha:]]+ [0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9]' '$0~/mounted/{print s,$0}{s=RT}' RT_file
Sun Jan 2 07:42:56 2000
Database mounted in Exclusive Mode
Completed: ALTER DATABASE MOUNT
abc Jan 2 12:42:56 2000
Database mounted in Exclusive Mode
Completed: ALTER DATABASE MOUNT
Sun Jan 2 23:00:00 2009
Database mounted in Exclusive Mode
Completed: ALTER DATABASE MOUNT
RS:The input record separator, by default a newline.
RT:The record terminator. Gawk sets RT to the input text that matched the character or regular expression specified by RS.
[root@mip blog]# awk -v RS='[[:alpha:]]+ [[:alpha:]]+ [0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9]' '$0~/mounted/{print RT}' RT_file
Sun Jan 2 07:42:56
Sun Jan 2 23:00:00
[root@mip blog]# awk -v RS='[[:alpha:]]+ [[:alpha:]]+ [0-9] [0-9][0-9]:[0-9][0-9]:[0-9][0-9]' '$0~/mounted/{print s}{s=RT}' RT_file
Sun Jan 2 07:42:56
abc Jan 2 12:42:56
Sun Jan 2 23:00:00
所以你大概也看到了RT的用法呢就是{print s}{s=RT},而不能直接{print RT}
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