E

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e-mail
        configuring firewall settings for
        forwarding for existing user accounts
        Pine program
        piping output to
        sending from command line
        spam
e-mail servers
        configuring Postfix
        forwarding e-mail for existing user accounts
        providing remote access to IMAP and POP servers
        sending mail to IP addresses
echo command 2nd
edit mode ( vi editor) 2nd
editing [See also emacs editor; vi editor]
        adding text ( vi )
        changing text ( vi )
        cheat sheets ( vi )
        command mode (vi) 2nd
        commands for editing files
        commands for text editing ( vi )
        copy-and-paste function (vi)
        cursor movement (vi)
        deleting text (vi)
        edit mode (vi) 2nd
        emacs for 2nd 3rd 4th
        files from command line
        navigation (vi)
        repeating last command (vi)
        saving (vi)
        search-and-replace (vi)
        text from command line
        undoing changes (vi)
        vim and vi
        word wrap (vi)
egrep command
        about
        creating atom with
        finding lines where one character varies
        options for
        regular expressions with
        rules and tools for building atoms
        testing regular expressions
        using wildcard character with 2nd
elif (else if) statements
emacs editor
        about 2nd
        starting
        using
enabling
        ACLs
        SSH server software
encryption
        encrypted passwords in Mac OS X
        encrypted transactions with scp
        password
env command
environment variables [See also PATH environment variable]
        $USER
        common
        making durable changes in
        setting
        setting FTP_PASSIVE to true
        using in shell scripts
        viewing
error messages
        interpreting
        watching system-startup
Esc key
escaping characters
        escape sequences for bash
        using backslash for 2nd 3rd 4th 5th
ettercap 2nd
ex editor
execute permissions
        about
        cautions with
        for files and directories
expr command
expressions
        shell script test
        test
        using in scripts
extended attributes
eXtensible Markup Language. [See XML]
extracting output from data