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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

Shell Scripting

  • Anonymize Logs
    • Locate target logs for processing
    • Identify sensitive data
    • Write script to anonymize sensitive data
    • Work with Logs and Scripts in anonymized mode
  •  
  • Process N Logs
    • Discuss limitiations of default invocation
    • Force N number of CLI arguments
    • Confirm CLI arguments
    • Ensure existence of supplied input file(s)
    • Test input logic
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  • Storage Check
    • Extend script to handle new functions
    • Calculate available storage
    • Ensure storage can support generated output
    • Test supplied input against available storage
    • Debug as needed
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  • Fixed-Length Records
    • Create script to check input field lengths
    • Use Regular Expressions to check input
    • Except non-standard records
    • Process records
    • Identify mismatches
    • Integrate fixed-length checks into main script
    • Test and debug where applicable
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  • Multiple Spaces | Tab Delimiter
    • Retrofit script to process variable whitespace input
    • Use SED to parse input stream
    • Test variable input streams against Awk && SED
    • Debug as needed
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  • Apache Timestamp Conversion
    • Examine default log entries
    • Compare with ISO standard and MySQL support
    • SHELL-test timestamp conversions using: Awk
    • Alter script to transform timestamp to numeric ISO standard
    • Rearrange time values to match ISO standard
    • Confirm conversions
  •  
  • Apache Log Stats
    • Use Apache Logs as Database
    • Ascertain: Total Bytes
    • Summarize Largest Requests
    • Average Bytes across Requests
    • Top 5 Largest Requests
    • Most Frequent Status Codes
    • Top IPs
  •  
  • CSV Output | MySQL Import
    • Retrofit anonymize script to yield CSV
    • Enclose all fields with double quotes
    • Generate output (CSV) and confirm
    • Import CSV data into MySQL
    • Test efficacy
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  • Free Memory & Swap
    • Define reusable stub
    • Integrate with existing processes
    • Vary thresholds
    • Execute and evalute
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  • Get Data from Instances
    • Write script to ascertain remote node's network details
    • Create stub script to parallelize calls via: parallel-ssh
    • Test parallelization on targets
    • Log data
    • Cron script
    • Extend script to yield: Memory && storage details
    • Confirm results
  •  
  • Find Files of Interest
    • Stub 'find' to locate files of interest
    • Vary input and searches
    • Evaluate
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  • Identify Common Bottlenecks
    • Identify helper utilities
    • Parse output to expose interesting metrics
    • Summarize metrics
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  • TCP States | Apache Stats
    • Grab TCP states from targets
    • Summarize output
    • Ascertain Apache Stats across instances
    • Evaluate results
  •  
  • xargs | Files | DIRs | Spaces
    • Generate Files | DIRs
    • Sample Problem
    • Employ find | xargs to Address
    • Evaluate
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