Extracting a 7-Zip file "silently" - command line option

user_356951 0
Viewed 69959

I want to extract a 7-Zip archive in a Python script. It works fine except that it spits out the extraction details (which is huge in my case).

Is there a way to avoid this verbose information while extracting? I did not find any "silent" command line option to 7z.exe.

My command is

7z.exe -o some_dir x some_archive.7z
7zip
13 Answers

7-zip has not such an option. Plus the lines printed at each file compressed are supposed to display at the same spot without newline, erasing the previous one, which has a cool effect. Unfortunatly, in some contexts (Jenkins...) it produced several lines ☹️ flooding the console.

NUL (windows) is maybe one solution.

7-zip.exe -o some_dir x some_archive.7z>NUL
user_48248540

Examining 7zip source I found hidden -ba switch that seems to do the trick. Unfortunately it is not finished. I managed to make it work with several modifications of sources but it's just a hack. If someone's interested, the option variable is called options.EnableHeaders and changes are required in CPP/7zip/UI/Console/Main.cpp file. Alternatively you can poke 7Zip's author to finish the feature in tracker. There are several requests on this and one of them is here.

user_14978310

To show just the last 4 lines...

7z x -y some_archive.7z | tail -4

gives me:

Everything is Ok

Size:       917519
Compressed: 171589

The switch -y is to answer yes to everything (in my case to override existing files).

user_12470390

On Unix-like operating systems (Linux, BSD, etc.) the shell command 7z ... >/dev/null will discard all text written by 7z to standard output. That should cover all the status/informational messages written by 7z.

It seems that 7z writes error messages to standard error so if you do >/dev/null, error messages will still be shown.

user_62722770

As told by Fr0sT above, -ba switch outputs only valid things (at least in list option on which I was trying). 7z.exe l archive_name.zip

7z.exe l -ba archive_name.zip

made great difference, esp for parsing the output in scripts. There is no need to modify anything, just use -ba switch in version19. This was also told bysomeone above. I'm putting as answer as I can't comment.

user_33527690
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