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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
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If you want extract files with full paths, you must use x (Extract with full paths) command. 7-Zip will prompt the user before overwriting existing files unless the user specifies the -y (Assume Yes on all queries) switch. If the user gives a no answer, 7-Zip will prompt for the file to be extracted to a new filename.
Invoke the version of 7Zip you are using by entering "7z" for P7Zip (7z.exe), or "7za" for 7Zip for Windows (7za.exe) to start either the P7-Zip or 7za application prior to entering commands. Other than this program invocation command, all commands, parameters and switches are identical for all command-line versions.
I just came across this when searching for the same, but I solved it myself! Assuming the command is processed with Windows / DOS, a simpler solution is to change your command to:
7z.exe -o some_dir x some_archive.7z > nul That is, direct the output to a null file rather than the screen.
Or you could pipe the output to the DOS "find" command to only output specific data, that is,
7z.exe -o some_dir x some_archive.7z | FIND "ing archive" This would just result in the following output.
Creating archive some_archive.7z
or
Updating archive some_archive.7z**
My final solution was to change the command to
... some_archive.7z | FIND /V "ing " Note double space after 'ing'. This resulted in the following output.
7-Zip 9.20 Copyright (c) 1999-2010 Igor Pavlov 2010-11-18 Scanning Updating some_archive.7z Everything is Ok This removes the individual file processing, but produces a summary of the overall operation, regardless of the operation type.
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One possibility would be to spawn the child process with popen, so its output will come back to the parent to be processed/displayed (if desired) or else completely ignored (create your popen object with stdout=PIPE and stderr=PIPE to be able to retrieve the output from the child).
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Like they said, to hide most of the screen-filling messages you could use ... some_archive.7z | FIND /V "Compressing" but that "FIND" would also remove the error messages that had that word. You would not be warned. That "FIND" also may have to be changed because of a newer 7-zip version.
7-zip has a forced verbose output, no silence mode, mixes stderr and stdout(*), doesn't save Unix permissions, etc. Those anti-standards behaviors together put "7-zip" in a bad place when being compared to "tar+bzip2" or "zip", for example.
(*) "Upstream (Igor Pavlov) does not want to make different outputs for messages, even though he's been asked several times to do so :(" http://us.generation-nt.com/answer/bug-346463-p7zip-stdout-stderr-help-166693561.html - "Igor Pavlov does not want to change this behaviour" http://sourceforge.net/tracker/?func=detail&aid=1075294&group_id=111810&atid=660493
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