Department of Chemistry, University of Alberta         August 2001
NMR News 2001-04
News and tips for users of the Varian NMR systems in the Department

There are no fixed publishing dates for this newsletter; its appearance solely depends on whether there is a need to present information to the users of the spectrometers or not.

Other content of this NMR News is no longer meaningful and has been removed April 2010.



user accounts


deleting macros

User accounts
Most users are very aware that it is important to run the spectrometer with the correct user name. Occasionally, this is ignored or forgotten, especially when one user just hands the spectrometer over to the next one without logging out of the system. If this is done then the second user has read, write and delete permissions on the entire data collection of the previous user group. If (s)he writes data on disk they will have the wrong ownership and they will be hard to find. Do not expect help in the search for the lost data. You are responsible for using the correct username. If you are unsure what the current username is, type vnmruser or whoami on the VNMRJ command line and you will know for sure. If it is the wrong username, log out and back in - saves a lot of trouble later on!

Deleting macros
VNMR and VNMRJ have the nice capability that users can make their own macros. A macro is basically a collection of commands put together for easier use of the system. A macro can be a few simple lines or a multiple page construct with Boolean logic etc.

Lets say, as an example, the user nmrlab creates a macro called bigplot. In the future, every time this macro is used in the nmrlab account, exactly this macro and no other one will be executed. This implies that if VNMRJ or EZNMR uses a macro bigplot this version of bigplot will no longer be used in the nmrlab account. It is also possible to edit an existing VNMRJ macro (whether in a useful or not so useful way…). From then on the macro may not work anymore at all or work differently causing problems in a multi-user environment. All this is a consequence of the fact that the program always looks first in the user’s library (nmrlab in this case), then in the EZ NMR collection of macros and finally in VNMRJ's own collection of macros and commands.. bigplot does not exist and therefore its creation would not cause any harm, but hundreds of names are in use. Therefore, starting August 7, 2001 all NMR computers (spectrometer hosts and data stations) will check all users’ vnmrsys directories for duplications of VNMR or EZ NMR files. If duplications are found they will be copied to the users ~/temp directory then deleted in the vnmrsys sub-directories. This procedure will occur daily.

top of page    NMR News