如何使用split命令分割alert文件

$ which split
/bin/split
$ split -b 10m -a 3 alert_mmsdb.log alert
$ ls -l al*
-rw-r--r--   1 oracle   dba      187266549 Dec  2 10:43 alert_mmsdb.log
-rw-r--r--   1 oracle   dba      10485760 Dec  2 10:45 alertaaa
-rw-r--r--   1 oracle   dba      10485760 Dec  2 10:45 alertaab
-rw-r--r--   1 oracle   dba      10485760 Dec  2 10:45 alertaac
-rw-r--r--   1 oracle   dba      10485760 Dec  2 10:45 alertaad
-rw-r--r--   1 oracle   dba      10485760 Dec  2 10:45 alertaae
-rw-r--r--   1 oracle   dba      10485760 Dec  2 10:45 alertaaf
-rw-r--r--   1 oracle   dba      10485760 Dec  2 10:45 alertaag
-rw-r--r--   1 oracle   dba      10485760 Dec  2 10:45 alertaah
-rw-r--r--   1 oracle   dba      10485760 Dec  2 10:45 alertaai
-rw-r--r--   1 oracle   dba      10485760 Dec  2 10:45 alertaaj
-rw-r--r--   1 oracle   dba      10485760 Dec  2 10:45 alertaak
-rw-r--r--   1 oracle   dba      10485760 Dec  2 10:45 alertaal
-rw-r--r--   1 oracle   dba      10485760 Dec  2 10:45 alertaam
-rw-r--r--   1 oracle   dba      10485760 Dec  2 10:45 alertaan
-rw-r--r--   1 oracle   dba      10485760 Dec  2 10:45 alertaao
-rw-r--r--   1 oracle   dba      10485760 Dec  2 10:45 alertaap
-rw-r--r--   1 oracle   dba      10485760 Dec  2 10:45 alertaaq
-rw-r--r--   1 oracle   dba       9008629 Dec  2 10:45 alertaar

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