/**********************************************************************

 *                  Linux大文件分割splite

 * 说明：

 *     编译RK3288 Android源代码的时候发现，Android源代码是tar包被分割成四份，

 * 查了一下资料才知道用了splite进行分割；

 *

 *                                2018-5-7 深圳 宝安西乡 曾剑锋

 *********************************************************************/

一、参考文档：

    . Linux split命令

        http://www.runoob.com/linux/linux-comm-split.html

二、split help：

    Usage: split [OPTION]... [FILE [PREFIX]]

    Output pieces of FILE to PREFIXaa, PREFIXab, ...;

    default size is  lines, and default PREFIX is 'x'.

    With no FILE, or when FILE is -, read standard input.

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

      -a, --suffix-length=N   generate suffixes of length N (default )

          --additional-suffix=SUFFIX  append an additional SUFFIX to file names

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

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

      -d                      use numeric suffixes starting at , not alphabetic

          --numeric-suffixes[=FROM]  same as -d, but allow setting the start value

      -e, --elide-empty-files  do not generate empty output files with '-n'

          --filter=COMMAND    write to shell COMMAND; file name is $FILE

      -l, --lines=NUMBER      put NUMBER lines/records per output file

      -n, --number=CHUNKS     generate CHUNKS output files; see explanation below

      -t, --separator=SEP     use SEP instead of newline as the record separator;

                                '\0' (zero) specifies the NUL character

      -u, --unbuffered        immediately copy input to output with '-n r/...'

          --verbose           print a diagnostic just before each

                                output file is opened

          --help     display this help and exit

          --version  output version information and exit

    The SIZE argument is an integer and optional unit (example: 10K is *).

    Units are K,M,G,T,P,E,Z,Y (powers of ) or KB,MB,... (powers of ).

    CHUNKS may be:

      N       split into N files based on size of input

      K/N     output Kth of N to stdout

      l/N     split into N files without splitting lines/records

      l/K/N   output Kth of N to stdout without splitting lines/records

      r/N     like 'l' but use round robin distribution

      r/K/N   likewise but only output Kth of N to stdout

    GNU coreutils online help: <http://www.gnu.org/software/coreutils/>

    Full documentation at: <http://www.gnu.org/software/coreutils/split>

    or available locally via: info '(coreutils) split invocation'