How to catch error message given by a command

[jcdole]

hello.
This command give a screen error message :

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~> VBoxManage showvminfo "UUID_REPAIR_B"
VBoxManage: error: Could not find a registered machine named 'UUID_REPAIR_B'
VBoxManage: error: Details: code VBOX_E_OBJECT_NOT_FOUND (0x80bb0001), component VirtualBoxWrap, interface IVirtualBox, callee nsISupports
VBoxManage: error: Context: "FindMachine(Bstr(VMNameOrUuid).raw(), machine.asOutParam())" at line 2733 of file VBoxManageInfo.cpp

The error code return by "$?" is 1 , that mean an error occur.

Is it possible to redirect the output to a temporary file like this :

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VBoxManage showvminfo "UUID_REPAIR_B" > /tmp/some_error.txt

I got the file '/tmp/some_error.txt' but it is empty.

Any help is welcome.

[mpack]

Puzzling.

The answer will depend on the OS.

But - you posted in "Linux Guests". Are you asking how to type a command at a Linux guest terminal prompt? You can't access the host VirtualBox software at a guest terminal.

[fth0]

In bash (and many other shells), use

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VBoxManage showvminfo "UUID_REPAIR_B" > /tmp/some_error.txt 2>&1

which redirects both stdout and stderr to the file. Note that the order of the redirections is important and correct that way, although being counter-intuitive. Google "2>&1" if you want to learn more about it.

[jcdole]

Great.
Thank you very much