The first command:
java -jar myjar.jar -cp ./bin testng-qc-sanity-regression.xml
will try to execute your main class defined in the jar file under META-INF/MANIFEST.MF which is not what you want.
The second command
java -cp D:Profilesuser.m2
epositoryorgestngestng6.8.5estng-6.8.5.jar; org.testng.TestNG testng-qc-sanity-regression.xml
is not defining the current directory on classpath and there is also a typo in the path.
Try to use the following:
java -cp ".;D:Profilesuser.m2
epositoryorgestngestng6.8.5estng-6.8.5.jar" org.testng.TestNG testng-qc-sanity-regression.xml
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