Lecture 0 - PATH, basic scripts, editor
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    Check your $PATH for ~/bin.
        echo $PATH
    How to add to your $PATH.
        (How to add to .bashrc)
    How to write a script.
        (#!/path/to/interpreter)
    How to mark your scripts executable.
        (chmod +x /path/to/script or chmod +x /path/to/*)
    Let's do a couple versions of "Hello World"
    
    a. Hello World!
    b. Hello David L. Willson, You're the $world to me!
    c. Who are you again? Oh! Hello ___, You're the $world to me!

Lecture 1 - Bash Stuph
----------------------
history
    history
    $HISTSIZE
    $HISTFILESIZE
    $HISTTIMEFORMAT
    <control>+r
    ^that^this
    !!, !123, !string

chaining
    ;
    &&
    ||

pipelining and redirection
    |
    >
    >>
    <
    2>&1

command-output-nesting
    $( ) <- These are nestable
        e.g.: for i in $( seq $( get_start_num ) 100 )
    ``   <- This form is archaic, but be aware of it

brace expansion
    {this,that,theotherthing}

escaping special characters and line-continuation
    \ = escape char
    in front of any special-char, suppresses meaning
    long\ filename = "long filename"
    echo this long\
    line

completion
    tab
    tab-tab
    progs, files, vars, etc...

Lecture 1 - internal and external utilities
-------------------------------------------
    ls -al, -R, -d, -F, -ltr
    test [] -eq -f -d 
    sort -n -r
    grep -E -v
    awk/sed/perl
    cut -d -f
    tr -s -d
    echo -e -n
        '' = hard quotes do not allow interpretation
        "" = soft quotes allow interpretation
        \n = newline
        \t = tab

Lab 1
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Use echo to build a table of names and email addresses, as shown.
    echo -e "me\tme@my.com\nyou\tyou@your.com\nhim\thim@his.com
Change the last line to suppress interpretation of special characters.
Use sed to replace the word needle with noodle, as shown.
Use cut and sort to show the list of users on your system.

looping and branching
    if (); then ...; elif (); then ... ; else ... ;fi
    while (); do ...; done
    for var in (space-delimited-list); do ...; done

sub-shells and compound expressions
    () = sub-shell
    {} = compound statement

environment, arguments, and other variables
    $@ and $* = whole command line, two ways
    $? = exit status of last
    $0 = name of program, as called
    $1, etc = arguments to program
    $# = number of arguments
    
Lab 2
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Lecture 3
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regular expressions

erroring and logging

bash -eux (look up eq options)

Last Lab
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