Elvis Njau / SOC Analyst (L2)

Scripting case study

Portable Bash Automation for Secure Data Transformation

Built and tested a portable Bash workflow that reads password entries, skips blank lines, selects a working Base64 implementation, and writes ordered results with explicit failure handling.

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Skills demonstrated

  • Validated that the input exists and is readable before processing.
  • Probed available encoders and verified each candidate against a known value.
  • Trimmed whitespace, skipped empty records, and preserved source order.
  • Used non-zero exit codes and actionable messages for missing files, permissions, and unavailable tooling.

Tools used

  • Bash
  • base64
  • OpenSSL
  • Python 3 fallback
  • POSIX file controls

Technical walkthrough

Lab evidence and investigation steps.

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Ref 1: A bashscript named base64script.sh that takes input from afile named passwords and outputs base 64 encoded passwords stored to file named encodedoutput.txt
Ref 1: A bashscript named base64script.sh that takes input from afile named passwords and outputs base 64 encoded passwords stored to file named encodedoutput.txt
Ref 2: Error handling: when non existent input file sadfsaf is used as input the error message “file does not exist” is displayed and script terminates.
Ref 2: Error handling: when non existent input file sadfsaf is used as input the error message “file does not exist” is displayed and script terminates.