scripts: add common script defs

scripts/common.sh

+die() {
+  n="$1" ; shift ; >&2 printf "[%s] $(tput setaf 1)%s$(tput sgr0)\\n" "$( now )" "$*" ; exit "$n"
+}
+export -f die
+log() {
+  >&2 printf "[%s] $(tput setaf 2)%s$(tput sgr0)\\n" "$( now )" "$*"
+}
+export -f log
+err() {
+  >&2 printf "[%s] $(tput setaf 3)%s$(tput sgr0)\\n" "$( now )" "$*"
+}
+export -f err
+big() {
+  >&2 printf \\n###\\n#\\n#\ %s\\n#\\n###\\n\\n "$*"
+}
+export -f big
+now() {
+  # shellcheck disable=SC2120
+  date -u "+%Y-%m-%dT%H:%M:%S" "$@" | sed 's/N/000000000/'
+}
+export -f now