fobban: the file and directory names are stored in a SQLite database and accessed using the TclSQLite extension, not a read from text file.
On a side note: The variable doesn't have to be unset if it's a procedural/local variable, since Tcl's reference counting will destroy it once the function exits. If the variable is scoped in a namespace (i.e. the global namespace), it would have to be unset. This doesn't apply to nxTools, since databases are not accessed in the same manner that newdir accesses log files.
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