-bs{o|e|p}{0|1|2}
| {id} | Stream Type | 
|---|---|
| o | standard output messages | 
| e | error messages | 
| p | progress information | 
| {N} | Stream Destination | 
|---|---|
| 0 | disable stream | 
| 1 | redirect to stdout stream | 
| 2 | redirect to stderr stream | 
Default values: o1, e2, p1.
7z t a.7z -bse1 > messages.txt
tests a.7z archive and sends error messages to stdout that is redirected to messages.txt
7z a -si -so -bsp2 -txz -an < file.tar > file.tar.xz
compresses file.tar (from stdin) to file.tar.xz (stdout stream) and shows progress information in stderr stream that can be seen at console window.
a (Add), d (Delete), h (Hash), l (List), e (Extract), u (Update), x (Extract with full paths)