allow control D keyboard sequence to work

the EOF key (generally control D) gets trapped/ignored by the shell on some systems.  Here's how to turn that off:

 

 

hit control-D
server$ Use 'exit' to logout

server$ set -o | grep ignoreeof
ignoreeof        on

server$ set +o ignoreeof

server$ set -o | grep ignoreeof
ignoreeof        off

server$ hit cntl-D
logout