Detailed explanation of file splitting and merging methods under Linux

File splitting under Linux can be achieved through the split command. You can split a large file into multiple files of specified sizes, and the splitting speed is very fast. You can specify two modes: split by line number and split by size. . File merging under Linux can be achieved through the cat command, which is very simple.

Use split to split files under Linux

Read the help document first

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

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 ) Specify the suffix length of the split file

-b, --bytes=SIZE Put SIZE bytes per output file Split by bytes, the default unit is bytes

-C, --line -bytes=SIZE put at most SIZE bytes of lines per output file Specify the maximum size of a single line, the default unit is bytes

-d, --numeric-suffixes use numeric suffixes instead of alphabetic Use numbers as a split file Suffix

-l, --lines=NUMBER put NUMBER lines per output file Split by number of lines

--verbose print a diagnostic just before each

output file is opened

--help display this help and exit

--version output version information and exit

Mode 1: Specify the number of file lines after splitting

For txt text files, you can split the file by specifying the number of lines in the split file.

Command:

split -l 300 large_file.txt new_file_prefix

After segmentation, the suffixes aa, ab, ac...are generated by default and so on. Of course, the suffixes can also be customized.

Mode 2: Specify the file size after splitting

split -b 10m server.log waynelog

We can also separate binary files by file size.

Use cat to merge files under Linux

Command:

cat small_files* > large_file

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