XDGRUNTIMEDIR

XDGRUNTIMEDIR is not a standard environment variable documented in the Linux XDG Base Directory Specification or in common Unix/Linux system conventions. It does not appear in official references and is likely a misspelling, a private alias, or a vendor-specific variable introduced by particular software. In most environments, software should rely on XDG_RUNTIME_DIR to locate the user-specific runtime directory.

XDG_RUNTIME_DIR provides a per-user, temporary filesystem path intended for runtime files such as sockets, D-Bus communication endpoints, and PID files. The directory is typically created and managed by the user’s login or session manager, with restricted access (traditionally 0700 permissions) so that only the owner can read or write inside. It exists for the duration of the user session and is removed at logout, offering an isolated space for ephemeral runtime data.

If XDGRUNTIMEDIR appears in a script or configuration, it may reflect a custom environment variable defined by a particular setup or simply be a typographical error. For portability and interoperability, it is advisable to rely on XDG_RUNTIME_DIR and implement validation or fallbacks if a nonstandard variable is encountered. Administrators and developers should consult the specific application's documentation to determine whether XDGRUNTIMEDIR is defined and what it represents in that context.

In summary, XDGRUNTIMEDIR has no formal standing in standard Unix/Linux environments. When portability is a concern, default to XDG_RUNTIME_DIR and treat XDGRUNTIMEDIR as a nonstandard or undocumented variable unless explicitly documented by the software in question.