executing aliases from a file

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http://www.unix.com – hi there, i've got this alias i want assign only sometimes, and then work in the same shell with it (so when closing the shell the alias dissapears). As the alias is long, i want it to be in a executable file, so i just execute the script from a terminal and then i can access the alias from that same terminal. I've been playing with alias and export, but after executing the script, the alias is not recognized in the terminal. any help? xxx (HowTos)