File splitting command under Linux split

Usage: Split [options] ... [input [prefix]]
Split the input into fixed-size shards and output to prefix AA, prefix ab,... ；
The default is split units with 1000 behavior, and the default prefix is "x". If you do not specify a file, or
If the user file is "-", the data is read from the standard input.

The long option must use parameters that are also required for short options.
-A,--suffix-length=n specifies a suffix length of N (default = 2)
-B,--bytes= size specifies the byte size of each output file
-C,--line-bytes= size specifies the maximum row byte size in each output file
-D,--numeric-suffixes uses a numeric suffix instead of a letter suffix
-L,--lines= value specifies how many rows each output file has
--verbose output file characteristics before each output file is opened
--HELP Display this help message and exit
--version display version information and exit

The SIZE can be an optional integer followed by one of the following units:
KB 1000,k 1024,mb 1000*1000,m 1024*1024, also G, T, P, E, Z, Y.

Example:
$ ls-l
-rw-r--r--1 User User 3773144 May 10:54 splittest.tar.bz2

$split-A-b 800KB splittest.tar.bz2 sp
-A 3 #指定后辍为3位
-D #指定后辍为数字, not the default AA ab etc.
-B 800KB #分割的大小
SP #前辍

$ls-L
-rw-r--r--1 User User 800000 May 11:05 sp000
-rw-r--r--1 User User 800000 May 11:05 sp001
-rw-r--r--1 User User 800000 May 11:05 sp002
-rw-r--r--1 User User 800000 May 11:05 sp003
-rw-r--r--1 User User 573144 May 11:05 sp004
-rw-r--r--1 User User 3773144 May 10:54 splittest.tar.bz2
As you can see, sp000-sp004 is the split file.


Merge:
$cat sp00* >splittest1.tar.bz2
$ls-L
-rw-r--r--1 User User 800000 May 11:05 sp000
-rw-r--r--1 User User 800000 May 11:05 sp001
-rw-r--r--1 User User 800000 May 11:05 sp002
-rw-r--r--1 User User 800000 May 11:05 sp003
-rw-r--r--1 User User 573144 May 11:05 sp004
-rw-r--r--1 User User 3773144 May 11:11 splittest1.tar.bz2
-rw-r--r--1 User User 3773144 May 10:54 splittest.tar.bz2
As you can see, the merged file splittest1.tar.bz2 is consistent with the splittest.tar.bz2 size before the split

$ md5sum splittest1.tar.bz2
12951203bd64c314d14a57b5d57f2592 splittest1.tar.bz2
$ md5sum splittest.tar.bz2
12951203bd64c314d14a57b5d57f2592 splittest.tar.bz2

Compare the MD5 checksum of two files respectively to confirm that the merge is correct.

File splitting command under Linux split