KODE TERMINAL DI UBUNTU

You can see current search path with following command:
 

$ echo $PATH

Sample outputs:

/usr/bin:/bin:/usr/sbin:/sbin:/usr/X11R6/bin:/usr/local/bin:/home/vivekgite/bin

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

/bin/ls

$ which gcc

/usr/bin/gcc

$ which date

/bin/date
 

$ which cal

/usr/bin/cal

$ whereis gcc

/usr/bin/gcc

You can run a program using its full pathname as follows:

$ /bin/ls
$ /bin/date

Finally, sometime you may not have permission to run the command.

Example

Let's assume the program you want to execute is called "cal" and you get a "Command not found" message from Unix or Linux. First, type the following command to see if you get a path name:
$ whereis cal
Sample outputs:

cal: /usr/bin/cal /usr/share/man/man1/cal.1.gz

If you do, you can invoke it using a full path name (e.g. /usr/bin/cal):

$ /usr/bin/cal

Sample outputs:

   September 2012
Su Mo Tu We Th Fr Sa
                   1
 2  3  4  5  6  7  8
 9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
30

Or You can add the path to your PATH variable in your shell start-up file $HOME/.cshrc (csh/tcsh) or $HOME/.bashrc (bash) file, then "source" the file:

$ vi $HOME/.bashrc

Add the path as follows:

PATH=$PATH:/home/vivek/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
export PATH

Save and close the file. Run the following command:
$ source ~/.bashrc
$ echo $PATH
$ cal

Finally, you can use the following command to search for cal command get a hit about its location.

$ find / -name cal -print

http://www.cyberciti.biz/faq/linux-unix-command-not-found-error-and-how-to-get-rid-of-it/

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