Reloading the $PATH from the GUI terminal

I used the command:

PATH=$PATH:/opt/lum/ls/os/linux/bin/;export PATH

in terminal to add that path to the path command, but every time I leave the terminal window and check it again with

echo $PATH

It is no longer in there.

PATH is an environment variable. When I open a terminal say terminal 1 and set some path in PATH variable it gets set which I can see using ech $PATH.

But when I open a new terminal say terminal 2 and fire echo $PATH why cannot I see the same output as seen in terminal terminal 1? Why the path added to PATH variable using one terminal is not reflected in another terminal?

In Linux Mint 13 MATE, the file manager Caja is set to use the path bar instead of the location entry for the directory path.

I'm trying to add a directory to my path so it will always be in my Linux path. I've tried:

export PATH=$PATH:/path/to/dir

This works, however each time I exit the terminal and start a new terminal instance, this path is lost, and I need to run the export command again.

How can I do it so this will be set permanently?

I accidentally unset all the directories of $PATH while trying to add a new one in ~/.bashrc. I opened a new terminal window as I was editing and now $PATH is empty. I'm worried if I boot from another drive to find the $PATH I won't be able to boot into this drive again.

Basically, what is the default result of echo $PATH?

As far as I understand, the usual way to add a path to the PATH environment variable is by concatenating paths separated by the : character.

I am new to Ubuntu (coming from Windows 7) and I am trying to add a directory to my system path and for some reason I can't get it to work.

I have an application named delphi in Delphi_Dp directory. Its PATH is /usr/kalyan/Downloads/Delphi_Dp

I have done export PATH=$PATH:/usr/kalyan/Downloads/Delphi_Dp

echo 'export PATH=$PATH:/usr/kalyan/Downloads/Delphi_Dp' >> ~/.bash_profile

But in terminal, when I type delphi, it is showing Command not found.

Please Help..

So I am using CentOS 6.3 a fresh install and I was trying to add things to my path for OpenMPI so I edited my .bash_profile file to read:

FOO='test' export FOO

# Add support for MPI PATH=$PATH:/usr/lib64/openmpi/bin

# User specific environment and startup programs

PATH=$PATH:$HOME/bin

export PATH

Which apparently isn't being read when I start up a bash shell, my $PATH is without the /usr