lt These operators are documented in perlop.

rmdir FILENAME rmdir Deletes the directory specified by FILENAME if that directory is empty. If it succeeds

chdir EXPR chdir FILEHANDLE chdir DIRHANDLE chdir

ref EXPR ref Returns a non-empty string if EXPR is a reference, the empty string otherwise. If EXPR is not

times Returns a four-element list giving the user and system times in seconds for this process and any exited children of this process.

getpwuid UID

endservent These routines are the same as their counterparts in the system C library. In list context, the return values from the various

endprotoent

join EXPR,LIST Joins the separate strings of LIST into a single string with fields separated by the value of EXPR, and returns that new string

umask EXPR umask Sets the umask for the process to EXPR and returns the previous value. If EXPR is omitted