Advanced Bash Scripting: Practical Building Blocks

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Advanced Bash scripting is less about memorising syntax and more about combining small shell features safely: arguments, functions, tests, loops and error handling.

Use strict mode carefully

#!/bin/bash
set -euo pipefail

This helps catch common mistakes, but test scripts properly because it can change how failures inside pipelines or unset variables behave.

Read arguments

input_file="${1:-}"
if [ -z "$input_file" ]; then
  echo "Usage: $0 file"
  exit 1
fi

Use functions

log() {
  echo "[$(date +%F_%T)] $*"
}

log "Starting job"

Keep scripts maintainable

  • Use clear variable names.
  • Quote variables unless you intentionally need word splitting.
  • Check return codes for important commands.
  • Prefer readable scripts over clever one-liners.

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