How to do compress and uncompress with 7z or zip under Linux

0. Install 7z 

sudo apt install p7zip-full

1. Compress

7z -v1800m a "a_file.7z" the_folder_you_want_to_compress/

or

zip -r -s 1800m a_file.zip the_folder_you_wanna_compress/

2. Uncompress

7z x "a_file.7z.*"

or

cat xx.zip* > xx.zip 
unzip xx.zip

​