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variable interpolation 2nd
variables
        adding to expr command
        assigning and interpolating 2nd
        commands used within
        defined
        reading user input into
        saving command output in
        shell script
        using environment variables in script
        using within other
        working with environment
verbose mode
versions
        Apache Web server
        grep
        IPv6 addresses
        Unix 2nd
        viewing Perl modules and available
vi editor
        about 2nd
        adding text
        changing text
        cheat sheets
        command mode 2nd
        commands for
        configuration file for
        configuring
        copy-and-paste function
        creating file with
        cursor movement
        deleting text in
        edit mode 2nd
        navigation in
        practice directory for
        quitting
        repeating last editing command
        saving files
        search-and-replace function
        starting
        undoing changes
        using vim and
        word wrap
viewing
        active Internet services and connections
        all groups 2nd
        commands for viewing files
        computer's hostname
        current aliases
        entire file without pausing
        environment variables
        file size
        firewall rules
        FQDN for IP address
        group information
        help for commands 2nd
        hidden files 2nd 3rd 4th
        history of logins
        open ports
        Perl README files
        processes
        system load and uptime
        system processes
        system-startup script
        text
        working directory
vim editor
vimtutor
virtual private networks (VPNs)
vm_stat command
volumes . [See also hard disks]
        Aqua's hierarchical display of
        boot
        freeing space on
        Unix
vpnd vulnerabilities
VPNs (virtual private networks)