-ao (Overwrite mode) switch
Specifies the overwrite mode during extraction, to overwrite files already present on disk.
-ao[a | s | t | u ]
|-aoa||Overwrite All existing files without prompt.|
|-aos||Skip extracting of existing files.|
|-aou||aUto rename extracting file (for example, name.txt will be renamed to name_1.txt).|
|-aot||auto rename existing file (for example, name.txt will be renamed to name_1.txt).|
7z x test.zip -aoa
extracts all files from test.zip archive and overwrites existing files without any prompt.
Commands that can be used with this switch
Switches: -y (assume Yes on all queries),