Does annybody knows an easy way to set environment variable when I can't save changes into hard disk?

I start linux from live-CD of LFS, so I can't save changes when modifing

an evironment variable. Now I know I can use command 'export' to modify an

environment variable from shell, but I can't write it into a script file, and I

must type such command a lot of times when I reboot by computer to set all of my environment variables.
(When I run the script containing command 'export PATH=/bin', the environment

variable PATH will not be set appropriately)

thanks

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