setting the environment variables in omnetpp

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ram polireddy

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May 22, 2013, 9:33:21 AM5/22/13
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i first installed ns2 and then i install omnetpp .For adding the environment variables i am unable to edit the  bashrc file.Then i got the following error message
 gedit ~/.bashrc

(gedit:19285): EggSMClient-WARNING **: Failed to connect to the session manager: None of the authentication protocols specified are supported


** (gedit:19285): WARNING **: Could not connect to session bus

plz help how to set the environment variables in bashrc file
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