shell命令之split

听人说做文本分类时处理100G的文本文件，居然不用大数据，处理方法就是用shell的split去分割成若干小文件。

split命令

NAME
       split - split a file into pieces

SYNOPSIS
       split [OPTION] [INPUT [PREFIX]]

DESCRIPTION
       Output  fixed-size pieces of INPUT to PREFIXaa, PREFIXab, ...; default size is 1000 lines, and 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

       -d, --numeric-suffixes
              use numeric suffixes instead of alphabetic

       -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.

-b按指定大小分割文件，支持b,k,m

例：

split -b 256m result_guid_active_train_all small

ll -lh

-rw-rw-r-- 1  256M Jun 17 20:29 smallaa
-rw-rw-r-- 1  256M Jun 17 20:29 smallab
-rw-rw-r-- 1  256M Jun 17 20:29 smallac
-rw-rw-r-- 1  256M Jun 17 20:29 smallad
-rw-rw-r-- 1  256M Jun 17 20:29 smallae
-rw-rw-r-- 1  256M Jun 17 20:29 smallaf
-rw-rw-r-- 1  256M Jun 17 20:29 smallag
-rw-rw-r-- 1  256M Jun 17 20:29 smallah
-rw-rw-r-- 1  256M Jun 17 20:29 smallai
-rw-rw-r-- 1  256M Jun 17 20:29 smallaj