Linux 下文件分割可以通过split 命令来实现，可以指定按行数分割和安大小分割两种模式。Linux 下文件合并可以通过cat 命令来实现，非常简单。
在Linux 下用split 进行文件分割：
模式一：指定分割后文件行数
对与txt 文本文件，可以通过指定分割后文件的行数来进行文件分割。
命令：split -l 300 large_file.txt new_file_prefix
模式二：指定分割后文件大小
对于可执行文件等二进制文件，则不能通过文件行数来进行文件分割，此时我们可以指定分割大小来分隔文件。
命令：split -b 10m large_file.bin new_file_prefix
对二进制文件我们同样也可以按文件大小来分隔。
在Linux 下用cat 进行文件合并：
命令：cat small_files* > large_file
Linx 文件分割命令split manpage ：
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.
AUTHOR
Written by Torbjorn Granlund and Richard M. Stallman.
REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org >.
COPYRIGHT
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software. You may redistribute copies of it under the terms
of the GNU General Public License <http://www.gnu.org/licenses/gpl.html >.
There is NO WARRANTY, to the extent permitted by law.
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 com-
mand
info split
should give you access to the complete manual.
