Linux , how do I append to the PATH and not mess up the existing PATH

If in need to add a PATH variable how do I add it and make it persist if I reboot?

i am sure it is to edit a file some where

this is ubuntu 14.01

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There's a system-wide PATH set in /etc/profile for bash, ksh, and other compatible shells.
Zephyr ICTCloud ArchitectCommented:
Or you can add something like this at the bottom of your .profile file

export PATH

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Oops. The system-wide PATH setting in Ubuntu appears to have been moved to the /etc/login.defs file.

It matters whether you want to change the path for just your own login or for everyone using the system. If it's really just for yourself, then spravtek has the appropriate answer.
Best is to not manipulate root's $PATH with login.defs
One option is to symlink execurables you need into /usr/bin,
Other is to make a new file /etc/profile.d/*

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