Change the current working directory to dir. If dir is omitted, the current directory is changed to the users home directory. For example,cd ~/octave
Changes the current working directory to ~/octave. If the directory does not exist, an error message is printed and the working directory is not changed.
List directory contents. For example,ls -l -| total 12 -| -rw-r--r-- 1 jwe users 4488 Aug 19 04:02 foo.m -| -rw-r--r-- 1 jwe users 1315 Aug 17 23:14 bar.m
lscommands are implemented by calling your system's directory listing command, so the available options may vary from system to system.