System Commands cd Changes the current directory to dir. chdir Changes the current directory to dir. cputime Returns the current cputime used by OML. date Returns the current date as a string in the format DD-MMM-YYYY. delete Deletes the file(s), f. diary Records the inputs and outputs of all commands in the terminal. dir Directory listing of the current or specified directory. dos Executes a dos command on Windows. ls Displays information and contents of file(s) or directories. mkdir Creates the directory newdir in the current working directory by default. rmdir Removes the directory dir. system Executes the shell command stringCommand. unix Executes the unix shell command stringCommand.