added scripts

linux/bash/adduser-sys.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+if [[ -z $1 || -z $2 ]]; then
+  echo "Usage: $0 USER UID"
+  exit 1
+fi
+
+usr=$1
+uid=$2
+addgroup --gid ${uid:?} ${usr:?} --system
+adduser --uid ${uid:?} --ingroup ${usr:?} ${usr:?} --disabled-password --gecos "" --system --no-create-home --shell /usr/sbin/nologin --home /nonexistent
+printf "[User]\nSystemAccount=true\n" > /var/lib/AccountsService/users/${usr:?}

linux/bash/chmod-dirs.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+find $2 -type d -exec chmod $1 {} \;