Linux commands--file operations--split, append, splice

Suppose the file test1 size is 20MB

(i) DD command

1. Intercept 30 bytes to file test2 on the head of the file test1:

DD If=test1 of=test2 Bs=1 count=32

2. Start capturing 6M size data from 2nd 6M of file Test1

DD if=test1 of=test2 bs=6m skip=1 count=1

3. Through the 2 command, you can write a shell script to split the file into multiple files of different sizes

4. Intercept 30 bytes from the head of the file test1, and then stitch up the 2 6M data to form a 30+6m byte file

DD If=test1 of=test2 Bs=1 count=32

DD if=test1 of=test3 bs=1 count=32

Cat Test3 >> Test2

Linux commands--file operations--split, append, splice