The l3sys-query script provides a method for TeX runs to obtain system information via shell escape to Lua. The facilities are more limited than the similar Java script texosquery, but since it uses Lua, l3sys-query can be used out of the box; with any installed TeX system. The script is written taking account of TeX Live security requirements; it is therefore suitable for use with restricted shell escape, the standard setting when installing a TeX system. The supported queries are ls Directory listing supporting a range of options pwd Obtaining details of the current working directory