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Hippos and cookies -- a meta-scripting overview by Russ Herrold

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Hippos and cookies
-- a meta-scripting overview

-- a presentation to the Central Ohio Linux User group
    December 30, 2000
         Owl River Company
              info@owlriver.com
                   614-221-0695

Coding standards:

GNU Coding Standards
ftp://prep.ai.mit.edu://pub/gnu/standards/standards.text

Nuclear Power Plant Code review
http://hissa.ncsl.nist.gov/publications/nistir4909/

Achievable
1. 'she-bang' to use /bin/sh
2. Location at the top
3. One sentence description
4. Usage
5. Explicit copyright and contact information
6. Sign your work; attribute sources
7. License
8. Revision history
1. Arguments expected
2. Inputs expected
3. Outputs produced
4. Options processing
5. Unix preference for pipes and simple tools
6. Comments -- you are writing them for a new you ...
7. Defensive coding
8. Revision history
1. "How does one eat a Hippo? From the toenails, up."
2. Hierarchy - top down design
3. Isolate into logical units
4. Input - Processing - Output
5. Organic - bottom up resolution
6. X-treme Programming - Start coding; satisfy the Requirements; Stop
7. 'Creature Feep'

Baking oatmeal cookies:

Gather the ingredients
Use the oven and mixer
Follow the recipe
Make it better
Why oatmeal anyway?

"These are a few of my favorite things ...":

Variables
- By convention, all CAPS

Assignment
Simple - ACME=test
Quoted - ACME=" red hen "
Backtick - ACME=` ls p* `
Exported - export ACME=test

Conditionals
[ -e /etc/passwd ] && { ... } LIMIT=5 [ "$TEST" -lt "$LIMIT" ] && { ... }

Loops
for i in list; do ... done

Math
NONCE=$[ 4 + 5 ]

Exit
exit 1

GOTO considered harmful
- Dykstra monograph on Structured Programming

"These are a few of my favorite things ..." - second chorus:

Shell Primitives




file-handles

append

create

here-docs

pipe

rm

touch

Shell Utilities




cat

cut

echo

head

ls

nl

sort

tac

tail

Small tools




awk

date

grep

md5sum

ps

sed

For more information, ...

apropos (also man -k)
info
man
-- secondary sources

at: http://www.colug.net/notes/0012mtg/COLUG-0012.html
Rev: 010111 - RPH

Print me:
lynxdump http://www.colug.net/notes/0012mtg/COLUG-0012.html | \
mpage -2 | lpr

examples examples to Hippos and cookies

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