You need to permanently change your path.
First you need to discover where the path is set, and then update it. For your local account, it’s probably set in ~/.profile or ~/.bash_profile.
Find the file with grep -l PATH ~/.[^.]* and edit it with your favorite editor; then source the file to have the change take effect immediately.
If you are root and you need to set the path for the entire system, the basic procedure is the same, but there are different files in /etc where the $PATH may be set, depending on your operating system and version.
The most likely file is /etc/profile,but /etc/bashrc, /etc/rc, etc/default/login~/.ssh/environment, and the PAM /etc/ environment files are also possible.
The grep -l PATH ~/.[^.]* command is interesting because of the nature of shell wildcard expansion and the existence of the /. and /.. directories.
The locations listed in the $PATH have security implications, especially when you are root.
If a world-writable directory is in root’s path before the typical directories (i.e., /bin, /sbin), then a local user can create files that root might execute, doing arbitrary things to the system.
This is the reason that the current directory (.) should not be in root’s path either.
To be aware of this issue and avoid it:
• Make root’s path as short as possible, and never use relative paths.
• Avoid having world-writable directories in root’s path.
• Consider setting explicit paths in shell scripts run by root.
• Consider hardcoding absolute paths to utilities used in shell scripts run by root.
• Put user or application directories last in the $PATH, and then only for unprivileged users.