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Release Info

To be productive with Nix, you must master the $SHELL; this usually equates to the BASH $SHELL, but most-certainly can be any installed $SHELL: /etc/shells. The wealth of useful Nix commands are largely accessible via the $SHELL. Using $SHELL semantics, it is possible to transform data in myriad applicable and useful ways. It all starts and ends with the $SHELL. Explore BASH $SHELL in this release.

Release Syllabus

BASH Shell Usage

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
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  • Find Failed Logins
    • Auto-generate requisite directory structure
    • Identify relevant logs
    • Default searched user
    • Integrate 'awk' & 'sed' accordingly
    • Correlate search string with defined user
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  • Core Dump Removal Simulation
    • Generate core dumps in disparate file system locations
    • Invoke simultaneous logs of activity
    • Qualify references
    • Mail process results
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  • Storage Availability Stub
    • Discuss relevance
    • Integrate 'df', 'awk', & 'grep'
    • Parse interesting output
    • Compare derivation with defined thresholds
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  • 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
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  • Logger Stub
    • Reveal usefulness
    • Define and contain parameters in a function
    • Integrate function accordingly
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  • 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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