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That looks OK. I don't know why you were getting the permission denied message. Maybe I misunderstood your question. Are you trying to add a directory to your PATH by changing your PATH permanently in /.bashrc?
Use whatever editor you want if you don't use vim and don't paste the output of the editor if it loads, even if it doesn't (clear the|use the alternate) screen, of course. But do post any error messages.
If it's owned by you and you have the 'rw' perms, you should be able to read/write it.
That's supposed to be 'head -1'. Then the editor itself, if head shows you a line. In the meantime, you can just 'export PATH=$PATH:/path/you/want' from the command line and, as long as you don't exit that shell, you'll have that path.
Incidentally, few people would know what 'NS2-allain one-2.32' is (including myself) but I noticed elsewhere you were actually running on Cygwin. That kind of information can be important. Since you are, you can always try opening it in edit (in a dos box) or notepad. If you have a decent editor that won't screw up the line endings, you can even edit it in Windows. And make sure the program wants a Cygwin path vs. a Window path.
sorry for typo
now when i type this following message come
$head -1 ~/.bashrc
i am working on fedora core 6.by specifying the path in command line its working fine.but i want to save it in bashrc file.how can i change it.
i was experimenting it to install NS2 on windows using cygwin.
but the problem i wrote is of linux...
Best thing is to go into your home dir and edit the file using eg vim:
or whichever editor you prefer.
My current work system doesn't have it, but iirc, PATH is usually set in the .bash_profile file.
Can't check my home system from here.