quartz/content/notes/04-scripting-techniques.md

title	tags
04-scripting-techniques	lectures cosc301

Least privilege

• sys admins should follow this principle
• users/proceses should not be given more privileges than they need
• processes always belong to users
• e.g.,
  • setuid: only when neccesary
  • web servers starts as root to open port 80, then switches to a less privileged user
  • temporary files shouldn't be in /tmp ⇒ everyone can access tmp, not secure

scripting

• history
• origin
• examples
• shbang
• good tips

bash

I/O and pipe

Env variables and files

interpolation

conditions

• if else
• case

loops

arithmetic

sed and awk

shell script vs c/c++

further reading