Pipeline step aborts with exit 2 and no error message

How to confirm it

• Reproduce it in isolation

  set -eo pipefail
  COUNT=$(grep -c 'nothing-matches-this' /etc/hosts)
  echo "never printed: $COUNT"

  grep exits 1 when it matches nothing. Under set -e inside a command substitution, that kills the script before the echo.

• Find every unguarded grep

  rg -n '\$\(.*grep' --glob '*.sh' | grep -v '|| true' | head -20

  Any command substitution containing grep without a guard is the same bug waiting for an input that matches nothing.

• The fix

  COUNT=$(grep -c 'pattern' file || true)
  # or, when zero matches is meaningful:
  if grep -q 'pattern' file; then ...; fi

  A search finding nothing is not an error. Say so explicitly rather than letting the shell decide.

• See where it died

  bash -x script.sh 2>&1 | tail -20

  Trace mode prints the last command executed before the abort, which is the one the exit code came from.