LinuxCBT BASH II Edition

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Bourne Again Shell (BASH) Scripting II

INIT & Cron Scripts

Identify features & characteristics

Parse INIT & Cron scripts

Explore variables & function references

Evaluate system applicability

Command Line Interface (CLI) Arguments

Explain features

Explore defaults

Pass arguments and evaluate interpolation

Expose CLI argument counter

Ensure appropriate CLI arguments upon invocation

Find Failed Logins

Auto-generate requisite directory structure

Identify relevant logs

Default searched user

Integrate 'awk' & 'sed' accordingly

Correlate search string with defined user

Core Dump Removal Simulation

Generate core dumps in disparate file system locations

Invoke simultaneous logs of activity

Qualify references

Mail process results

Storage Availability Stub

Discuss relevance

Integrate 'df', 'awk', & 'grep'

Parse interesting output

Compare derivation with defined thresholds

Check Remote Service

Explain objective

Identify remote service

Integrate SSH

Trap service status accordingly

Loop variable hosts

Debug appropriately

Backup Snapshots

Identify need

Integrate storage availability stub

Enlist 'tar' & 'bzip2'

Flex script to handle differential snapshots

Vary snapshot by day

Tidy remnants

Extend process to encrypt snapshots

Error-Handling

Restructure process to handle errors

Except positive & negative results

Define appropriate functions

Promulgate function references

Test efficacy

Free Memory & Swap

Define reusable stub

Integrate with existing processes

Vary thresholds

Execute and evalute

Logger Stub

Reveal usefulness

Define and contain parameters in a function

Integrate function accordingly

Checksum Generator

Identify objective

Integrate CLI ARGS stub

Integrate logger stub

Generate desired checksums for variable content

Purge History

Justify applicability

Explore history environment

Ensure history management across shell invocations

Monitor Page Loads

Explain scenario

Integrate 'wget'

Define thresholds

Code appropriate traps

Average page loads over time

Evaluate results

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