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
by-
We Specialize In cPanel Server Management
Affordable 24/7 Technical Support Company