| Statement | Function |
chdir(dirname) | Changes the name of the current directory to dirname. |
sleep({expr}) | Causes the Perl script to sleep for expr seconds or forever if expr is not specified. |
times | Returns a four-element array giving user and system CPU times in seconds for this process. |
warn(list) | Prints the concatenated value of list to STDERR. |
exit | Causes an immediate exit from the currently executing script. |