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Troubleshooting Guide: Telnet
98
GT-400 Terminal User’s Guide
Changing the password
Since all terminals come with a default telnet password
1520rsi
, you may wish to change it for
security. The command is simple:
1 At the prompt, type
passwd root
. This tells the shell you wish to change the password for the
user root. The change password dialog will appear.
2 Enter the new password. Be sure to conform to the requirements.
3 Enter the password again. The password is now changed.
Navigating the file system
Once you're at the prompt, you are communicating with the terminal at a command-line level. Think of
it like the DOS prompt in Windows. With DOS you may navigate the hard drive of your computer. With
telnet you may navigate the SD card of the GT-400. There are commands you can use to navigate the
directories, view files and start or stop programs. Some of the most useful commands will be listed
below (such as cd, tail, cat, and ps) and they are safe to experiment with as often as you want (as long
as you are sensitive to the case).
Changing Directories with cd
The command
cd
is used to move from directory to directory. For example, if you type
cd RecogSys
at the first prompt, you will be moved to the RecogSys directory.
The main directory is called
root
, so if you are ever asked to “cd to root”, simply type
cd
anywhere and you will be taken to the main directory.
One of the most useful features in Linux is filename/directory auto-fill. Change directories to
RecogSys, except instead of typing all of RecogSys out, simply type in the R and press the
Tab key on the keyboard. It's very convenient when you need to move to, say, RecogSys/Src/
Python/RSITerm: rather than typing out the full path, you can type "cd R+Tab, S+Tab, P+Tab,
RSIT+Tab". If there are multiple directories that start with the same letter, you'll need to fill in
enough letters to tell the shell what you want to auto-fill.
Viewing Terminal Processes with ps
The ps command is used to view a list of all the processes running in the terminal. If you've ever used
the Task Manager in Windows, viewing the Processes tab is basically the same thing. If you do a 'ps'
on an active terminal, you'll see a number of "python2.4 RSITerm.pyc" listings. These are all of the
active processes (or threads) of the terminal application. If you don't see any "python2.4…" processes
running, it means your terminal application has stopped.
To use the command, type
ps
at the prompt and press Enter.
Rebooting the terminal via telnet
When you are having trouble with your PC, often the first thing to do to clear the issue is to reboot it -
the same is mostly true for the GT-400. And just as you wouldn't yank the power cable out of your PC
to restart it, you shouldn't power cycle the GT-400 before trying to reboot it gracefully. If you are unable
to reboot through the command menus or the host server command, you can reboot it through the
telnet session.
The command is
restart
.
After you've entered this command, the terminal may take up to a minute to shut itself down.