QProcess::execute with su command

Question

I am trying to call tar from a Qt project:

QProcess::execute("/bin/su", {"-", "user", "-c", "\'/bin/tar xpf /tmp/smt.tbz2 -C /tmp\'"})

Bit I am getting:

-su: /bin/tar xpf /tmp/smt.tbz2 -C /tmp: No such file or directory

It looks like the su command does not interpret correctly the command after -c.

Also see [Run sudo command in Qt QProcess](https://stackoverflow.com/q/32063190/608639), [Executing Linux command as root in Qt](https://stackoverflow.com/q/7036588/608639), [How to get root permission inside Qt program?](https://stackoverflow.com/q/19840163/608639), [QProcess, communicate with 'su' command](https://www.qtcentre.org/threads/24898-QProcess-communicate-with-su-command), etc. — jww, Apr 26 '19 at 13:13

score 2 · Accepted Answer · answered Apr 26 '19 at 12:57

I think the problem is that you are quoting the command to run explicitly: QProcess goes to some lengths to ensure parameters are passed as-is rather than being split any further.

Instead try...

QProcess::execute("/bin/su", {"-", "user", "-c", "/bin/tar xpf /tmp/smt.tbz2 -C /tmp"});

QProcess::execute with su command

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