When you get the error “Command not found” it means that Linux or UNIX searched for command everywhere it knew to look and could not find a program by that name Make sure command is your path.

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

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

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

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