What is the output of the following command, if executed using the default shell for the root role account of a standard Live CD Install of Oracle Solaris 11? echo `$SHELL` 

Answer options:

A. /usr/bin/bash
B. /usr/bin/ksh
C. $SHELL
D. the PID for the current shell

C

Single quotes are most strict. They prevent even variable expansion. Double quotes prevent wildcard expansion but allow variable expansion. For example: #!/bin/sh echo $SHELL echo "$SHELL" echo `$SHELL` This will print: /usr/bin/bash /usr/bin/bash $SHELL