QProcess process; process.start("ls", QStringList() << "-l" << "/invalid/directory"); process.waitForFinished(); QByteArray errorOutput = process.readAllStandardError(); qDebug() << errorOutput;
QProcess process; process.start("my_script.sh"); process.waitForFinished(); QByteArray errorOutput = process.readAllStandardError(); if (!errorOutput.isEmpty()) { // handle the error qDebug() << errorOutput; }In this example, `my_script.sh` is executed and the standard error output is captured in `errorOutput`. If the output is not empty, it is treated as an error and `qDebug()` is used to print it. Both examples use the `QProcess` class and its `readAllStandardError` method to capture error output. The Qt package/library is used to support this functionality.