changes - hope they work

wcs-frame-match.sh

@@ -74,6 +74,16 @@ if [[ -n "$PRE_WORKDIR" ]]; then
   cd "$PRE_WORKDIR" 2>/dev/null || { echo "Error: WORKDIR '$PRE_WORKDIR' not accessible" >&2; exit 1; }
 fi
 
+# --- Logging setup (per-day log file)
+LOG_BASE="${LOGDIR:-"$HOME/log/wcs-match"}"
+mkdir -p "$LOG_BASE"
+LOG_FILE="$LOG_BASE/log.$(date +%Y-%m-%d).txt"
+# Append all subsequent output to the log file
+exec >>"$LOG_FILE" 2>&1
+
+START_EPOCH=$(date +%s)
+echo "=== wcs-frame-match start $(date -Iseconds) (PWD=$(pwd)) ==="
+
 # ---- Arg parsing
 REF_IMAGE=""
 USER_SET_THRESHOLD="false"
@@ -420,3 +430,7 @@ fi
 for f in "${FILES[@]}"; do
   process_file "$f"
 done
+
+END_EPOCH=$(date +%s)
+ELAPSED=$((END_EPOCH - START_EPOCH))
+echo "=== wcs-frame-match end $(date -Iseconds) (elapsed ${ELAPSED}s) ==="