Add script 'get_next_uid_gid_pair.sh'.

get_next_uid_gid_pair.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+min_uid=1000
+
+declare -i _id=$(expr $min_uid - 1)
+
+while true ; do
+   ((_id++))
+   $(id $_id > /dev/null 2>&1) && continue
+   $(cat /etc/group | cut -d ':' -f3 | grep -q $_id 2> /dev/null) && continue
+   break
+done
+
+echo
+echo "   Next free uid/gid pair:"
+echo
+echo -e "      uid: \033[1m$_id\033[m"
+echo -e "      gid: \033[1m$_id\033[m"
+echo
+
+exit 0