Add "parallel update" script to generate multiple markdown files simultaneously

Author: tianon

parallel-update.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+cd "$(dirname "$(readlink -f "$BASH_SOURCE")")"
+
+images=( */ )
+images=( "${images[@]%/}" )
+
+: "${PARALLELISM:=$(( $(nproc) * 2 ))}"
+
+xargs -rtn1 -P "$PARALLELISM" ./update.sh "$@" <<<"${images[*]}"