$ split --help
Usage: split [option]... [enter [prefix]]
Split the input content into fixed size fragments and output them to "prefix AA", "prefix AB";
The default split unit is 1000 lines, and the default prefix is "X". If no input is specified, or if the input is "-", the data is read from the standard input.
Parameters that must be used for long options are also required for short options.
-a. -- suffix length = n specifies that the suffix length is n (default is 2)
-b. -- bytes = size specifies the byte size of each output file
-C. -- line bytes = size specifies the maximum line byte size in each output file
-d. -- numeric suffixes use numeric suffixes instead of letter suffixes
-l. -- lines = a value that specifies how many lines each output file has
--Hibernate outputs file characteristics before each output file is opened
--Help displays this help message and exits
--Version displays version information and exits
Size can be an optional integer followed by one of the following units:
KB 1000, K 1024, MB 1000 * 1000, m 1024 * 1024, and G, t, P, e, Z, y.
Examples of use:
#Cut the file according to 200 lines, the file prefix is out, and the suffix is 4 for the length of the number
split -l 200 -d -a 4 input_file out
#Cut the file by 2m, the file prefix is log, and the suffix is letter
split -b 2M input_file log