sir
im using bash shell,and used commands given in read me file to insert environmental variables
export NCTUNSHOME=/usr/local/nctuns
export NCTUNS_TOOLS=/usr/local/nctuns/tools
export NCTUNS_BIN=/usr/local/nctuns/bin
also i used the alternate command "source/user/local/nctuns/etc/nctuns.bash"
but when i used command "printenv | grep NCTUns" to check whether environmental variables set,nothing showed out,which meant these variables not set.
i have disabled SELINUX and also ip table service was stopped.
please help me to set environmental varible, so that i can proceed my work.thanks in advance

I am no genius but did you add the $variable? Probably a stupid question, but the $ before the actual variable defines that variable in a local context...please let me know so I can help further!

actually the GUI manual given for the software, does not have $ symbol infront of variable, i too tried $ symbol in front of variable, but no change

linux is case sensitive. In your post you exported NCTUNS but in your grep you search for NCTUns. This will certainly fail to find any instances.

If you wish to do a case insensitive grep, do a grep -i NCTUns. Alternatively maintain your case. You also can check by doing an echo $NCTUNS_BIN (or whatever).