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if the package is installed from source code, service command wont work. service command will work only if you have installed the package using yum or rpm command.
Also you can check path of the commands using
$ echo $PATH
Usually, all user commands are in /bin and /usr/bin or /usr/local/bin directories. All your programs are installed in these directories. When you type the clear command, you are running /usr/bin/clear. So if it is not in your path try to add directories to your search path as follows (setup Linux or UNIX search path with following bash export command)
$ export PATH=$PATH:/bin:/usr/local/bin
You can also find out of path of any command with which or whereis commands:
$ which ls
And last but not least, linux is case sensitive. so make sure the case you are using is the right one ( silly mistake.but still can make problems)
...and obviously not SuSE 8.2! I wish it was, as it's a hell of an easier to remember/type than /etc/inet... etc etc
The "service" command is something that RedHat came up with years ago. It is not used in most distros. If you wish to use the service command instead of the above /etc/init.d/ commands then use Fedora, but even that is changing with their new systemd setup. service does still work for most basic commands like network, etc...