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split是linux下文件分割命令,对目标文件可以按行分割,也可以按大小进行分割.

 

[oracle@neworacle bdump]$ man split
SPLIT(1)                              FSF                             SPLIT(1)

NAME
       split – split a file into pieces

SYNOPSIS
       split [OPTION] [INPUT [PREFIX]]

DESCRIPTION
       Output  fixed-size  pieces of INPUT to PREFIXaa, PREFIXab, …; default
       PREFIX is `x’.  With no INPUT, or when INPUT is -, read standard input.

       Mandatory  arguments  to  long  options are mandatory for short options
       too.

       -a, –suffix-length=N
              use suffixes of length N (default 2)

       -b, –bytes=SIZE
              put SIZE bytes per output file

       -C, –line-bytes=SIZE
              put at most SIZE bytes of lines per output file

       -l, –lines=NUMBER
              put NUMBER lines per output file

       –verbose
              print a diagnostic to standard error  just  before  each  output
              file is opened

       –help display this help and exit

       –version
              output version information and exit

       SIZE may have a multiplier suffix: b for 512, k for 1K, m for 1 Meg.

AUTHOR
       Written by Torbjorn Granlund and Richard M. Stallman.

REPORTING BUGS
       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT
       Copyright ?2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is
       NO warranty; not even for MERCHANTABILITY or FITNESS FOR  A  PARTICULAR
       PURPOSE.

SEE ALSO
       The full documentation for split is maintained as a Texinfo manual.  If
       the info and split programs are properly installed at  your  site,  the
       command

              info split

       should give you access to the complete manual.

我们常使用他分割alert文件或某些很大的trace文件.分割后的文件名默认前缀以字母’x'开头,后面为任意两个字母的组合共同组成文件名.前缀我们也可以自行定义.

[oracle@neworacle bdump]$ ls -lh alert_idctest.log
-rw-r–r–    1 oracle   dba          827K Jun 24 13:23 alert_idctest.log

 

按行分割:

[oracle@neworacle bdump]$ split -l 1000 alert_idctest.log alert            
[oracle@neworacle bdump]$ ls -l alert*
-rw-r–r–    1 oracle   dba         46564 Jun 24 16:24 alertaa
-rw-r–r–    1 oracle   dba         50905 Jun 24 16:24 alertab
-rw-r–r–    1 oracle   dba         50824 Jun 24 16:24 alertac
-rw-r–r–    1 oracle   dba         51676 Jun 24 16:24 alertad
-rw-r–r–    1 oracle   dba         51314 Jun 24 16:24 alertae
-rw-r–r–    1 oracle   dba         51576 Jun 24 16:24 alertaf
-rw-r–r–    1 oracle   dba         51390 Jun 24 16:24 alertag
-rw-r–r–    1 oracle   dba         51317 Jun 24 16:24 alertah
-rw-r–r–    1 oracle   dba         51394 Jun 24 16:24 alertai
-rw-r–r–    1 oracle   dba         51353 Jun 24 16:24 alertaj
-rw-r–r–    1 oracle   dba         51494 Jun 24 16:24 alertak
-rw-r–r–    1 oracle   dba         51227 Jun 24 16:24 alertal
-rw-r–r–    1 oracle   dba         45925 Jun 24 16:24 alertam
-rw-r–r–    1 oracle   dba         48046 Jun 24 16:24 alertan
-rw-r–r–    1 oracle   dba         44002 Jun 24 16:24 alertao
-rw-r–r–    1 oracle   dba         43035 Jun 24 16:24 alertap
-rw-r–r–    1 oracle   dba         47827 Jun 24 16:24 alertaq
-rw-r–r–    1 oracle   dba          6961 Jun 24 16:24 alertar
-rw-r–r–    1 oracle   dba        846830 Jun 24 13:23 alert_idctest.log

 

按大小分割:

[oracle@neworacle udump]$ split -b 2000 idctest_ora_862_USERTRACE.trc USERTRACE
[oracle@neworacle udump]$ ls -l|grep "USERTRACE[a-z]"
-rw-r–r–    1 oracle   dba          2000 Jun 24 16:33 USERTRACEaa
-rw-r–r–    1 oracle   dba           215 Jun 24 16:33 USERTRACEab

 

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