include "sys.m";
sys := load Sys Sys->PATH;

chdir:  fn(path: string): int;

The working directory is the starting point for evaluating file names that do not begin with / or #, as explained in sys-intro(2).

When Inferno boots, the initial process has / for its working directory.

Applications that invoke chdir normally use the FORKNS option of sys-pctl(2) to prevent the change from affecting the surrounding environment.