Compress a file:
$ 7z a file.7z file
Compress a directory:
$ 7z a -r dir.7z dir
Extract a 7z file:
$ 7z x archive.7z
Compress a file:
$ 7z a file.7z file
Compress a directory:
$ 7z a -r dir.7z dir
Extract a 7z file:
$ 7z x archive.7z