Big News (1 of 3)

• New edition addition guy... Marcus, Jr.
• Big & Fast

Big News (2 of 3)

• C4CS Course Creator
• Towner Prize (Outstanding GSI) Winner
• Mr. Chez Betty
• All around Great Person

Big News (3 of 3)

• Git II Lecturer: IA Matt Terwilliger
• Personal redemption
• #SEEYOUINCLASS

Administrative

Regex/Regexp

What is it?

• 99 Problems
• All the "Big" tools use it
• Try out
  • www.regular-expressions.info
  • www.regexr.com
• Endless amusement during live demos

Regex/Regexp

What is it?

• 99 Problems
• All the "Big" tools use it
• Try out
  • www.regular-expressions.info
  • www.regexr.com
• Endless amusement during live demos

The Basics

• Special Characters \^$.|?*+()[]{}
• Character classes [<chars>]
• Shorthand classes \<char> and [[:class:]]
• Anchors
• Alternation
• Repetition
• Greedy & Lazy
• Grouping
• Backreferencing

Working on data by line

Get it out there

• cat
• echo
• head
• tail

Big Tools

• grep (g/re/p)
• sed
• awk

Other Tools

• cut
• tee
• tr
• sort
• uniq
• diff
• comm

3 Ways to get/use input/output

1. Use pipes (|) to connect multiple commands
2. Use redirection to read/write files
3. Use a subshell $() to assign to variables

File Redirection

File descriptors, name and number

• 0: Standard Input (stdin, cin)
• 1: Standard Output (stdout, cout)
• 2: Standard Error (stderr, cerr)

Operators

• < send file as input
• > send output to file (create/overwrite)
• >> append output to file (create/preserve)
• >& merge output
• <& merge input
• << "Here Document"

Scripts

• Just Do It!
  • history
• Shebang, Hashbang, #!
• Get that money...
  • $0 current script
  • $n script args 1, 2, 3...
  • $# number of args
  • $* and $@ quoted args
  • $? the previous return value
• Variables and Arrays
• Math... $((EXPRESSION))
• Spacing
  • Critical
  • Maddening

Control

• Functions

# Define
function_name() {
  statements
}
# Invoke
function_name
# Delete
unset .f function_name

• Loops
  • while (while, do, done)
  • for
  • until
  • select
  • break/continue
• Conditionals
  • if (if, then, elif, then, else, fi)