chdir, $ENV{PWD}

This function changes the working directory.

chdir EXPR; 
#
# remember the current directory
#
my $dirOld = $ENV{PWD}; 
#
# the following lines are equivalent
#
chdir "/home/user/"; 
chdir( $ENV{ "HOME"} || $ENV{ "LOGDIR"}); 
chdir (); 
chdir (getpwuid( $<)[7]);