The nsh -s command loads the C shell onto node 0 of the current hypercube. In order to use nsh, the hypercube must have at least four nodes. The shell process on node 0 then manages the distribution of processes created under the C shell to the other nodes of the cube. The exit command returns you to the UNIX shell from the node's C shell.
nsh uses three special files:
.login.ipscYou should create these files in your home directory. These files are used in the same way that UNIX uses the .login, .cshrc, and .logout files.
The node shell is typically used only when using the Concurrent File System (CFS) of the iPSC/860 (see Section 9).