command if [[ ! -f "$TM_NEW_FILE" ]]; then TM_DATE=`date +%Y-%m-%d` \ perl -pe 's/\$\{([^}]*)\}/$ENV{$1}/g' \ < index.html > "$TM_NEW_FILE" fi extension html name HTML — 4.01 Transitional scope text.html uuid E6F19171-F664-4B4F-92DA-3E15E6CAD35C