Linux常用基本命令(split )

split命令

作用：切割文件

格式:

split [option] [input] [prefix]

-l 指定分割后文件的最大行数

ghostwu@dev:~/linux/split$ cat -n ghostwu.txt
         What is Memcached?
         Free & open source,
         high-performance,
         distributed memory object caching system,
         generic in nature
         but intended for use in speeding up dynamic web applications by alleviating database load.
         Memcached is an in-memory key-value store for small chunks of arbitrary data
         (strings, objects) from results of database calls
         API calls, or page rendering.
        Memcached is simple yet powerful.
        Its simple design promotes quick deployment,
        ease of development
        and solves many problems facing large data caches.
        Its API is available for most popular languages.

把ghostwu.txt这个文件，每个文件最大6行，前缀为ghostwu_

ghostwu@dev:~/linux/split$ ls
ghostwu.txt
ghostwu@dev:~/linux/split$ wc -l ghostwu.txt
 ghostwu.txt
ghostwu@dev:~/linux/split$ split -l  ghostwu.txt ghostwu_
ghostwu@dev:~/linux/split$ ls
ghostwu_aa  ghostwu_ab  ghostwu_ac  ghostwu.txt
ghostwu@dev:~/linux/split$ wc -l ghostwu_ab
 ghostwu_ab
ghostwu@dev:~/linux/split$ wc -l ghostwu_aa
 ghostwu_aa
ghostwu@dev:~/linux/split$ wc -l ghostwu_ac
 ghostwu_ac

用通配符更简单

ghostwu@dev:~/linux/split$ ls
ghostwu_aa  ghostwu_ab  ghostwu_ac  ghostwu.txt
ghostwu@dev:~/linux/split$ wc -l ghostwu_*
   ghostwu_aa
   ghostwu_ab
   ghostwu_ac
  total

-a : 指定切割文件的后缀长度

ghostwu@dev:~/linux/split$ split -l  -a  ghostwu.txt ghostwu_
ghostwu@dev:~/linux/split$ ls
ghostwu_aaa  ghostwu_aab  ghostwu_aac  ghostwu.txt
ghostwu@dev:~/linux/split$ wc -l ghostwu_*
   ghostwu_aaa
   ghostwu_aab
   ghostwu_aac
  total

-d: 使用数字后缀

ghostwu@dev:~/linux/split$ ls
ghostwu.txt
ghostwu@dev:~/linux/split$ split -l  -d ghostwu.txt ghostwu_
ghostwu@dev:~/linux/split$ ls
ghostwu_00  ghostwu_01  ghostwu_02  ghostwu.txt
ghostwu@dev:~/linux/split$ wc -l ghostwu_*
   ghostwu_00
   ghostwu_01
   ghostwu_02
  total

-b　按文件大小

ghostwu@dev:~/linux/split$ ls
ghostwu.txt
ghostwu@dev:~/linux/split$ ls -lh
total .0K
-rw-rw-r--  ghostwu ghostwu  5月   : ghostwu.txt
ghostwu@dev:~/linux/split$ split -b  ghostwu.txt ghostwu_
ghostwu@dev:~/linux/split$ ls
ghostwu_aa  ghostwu_ac  ghostwu_ae  ghostwu.txt
ghostwu_ab  ghostwu_ad  ghostwu_af
ghostwu@dev:~/linux/split$ ls -lh
total 28K
-rw-rw-r--  ghostwu ghostwu  5月   : ghostwu_aa
-rw-rw-r--  ghostwu ghostwu  5月   : ghostwu_ab
-rw-rw-r--  ghostwu ghostwu  5月   : ghostwu_ac
-rw-rw-r--  ghostwu ghostwu  5月   : ghostwu_ad
-rw-rw-r--  ghostwu ghostwu  5月   : ghostwu_ae
-rw-rw-r--  ghostwu ghostwu   5月   : ghostwu_af
-rw-rw-r--  ghostwu ghostwu  5月   : ghostwu.txt