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GNU find in a QProcess - exec parameter doesn't work

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I’m running GNU find in a QProcess which works just fine. Nevertheless, when I try to combine it with grep, it does not execute at all. The QProcess is started with process->start(findpattern.replace("~",QDir::home().absolutePath()), QProcess::Unbuffered | QProcess::ReadWrite); When findpattern is e.g. find "~/Downloads" -name "*.cpp" this works just fine. But for e.g. finding all cpp files that contain “else” find "~/Downloads" -name "*.cpp" -exec grep -l "else" {} \; it fails What am I doing wrong?

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