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I just tested using QGIS 3.26.2 (on Linux) and it worked fine and loaded the specified project. If it does not work for you, please edit your question to provide more detail, such as exactly how you are trying to run the qgis --project projectfile command and what does happen when you run it.

These command line parameters are in the documentation under section 9. QGIS Configuration (9.6.1. Command line and environment variables)

I just tested using QGIS 3.26.2 (on Linux) and it worked fine and loaded the specified project. If it does not work for you, please edit your question to provide more detail, such as exactly how you are trying to run the qgis --project projectfile command and what does happen when you run it.

I just tested using QGIS 3.26.2 (on Linux) and it worked fine and loaded the specified project. If it does not work for you, please edit your question to provide more detail, such as OS, exactly how you are trying to run the qgis --project projectfile command and what does happen when you run it.

I just tested using QGIS 3.26.2 (on Linux) and it worked fine and loaded the specified project. If it does not work for you, please edit your question to provide more detail, such as exactly how you are trying to run the qgis --project projectfile command and what does happen when you run it.

I just tested using QGIS 3.26.2 (on Linux) and it worked fine and loaded the specified project. If it does not work for you, please edit your question to provide more detail, such as OS and exactly how you are trying to run the qgis --project projectfile command.

I just tested using QGIS 3.26.2 (on Linux) and it worked fine and loaded the specified project. If it does not work for you, please edit your question to provide more detail, such as OS, exactly how you are trying to run the qgis --project projectfile command and what does happen when you run it.