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In .bash_profile, should PS1 be defined before exporting?

As an example, the first line in my .bash_profile is currently:

export PS1="\[\033[36m\]\u\[\033[m\]@\[\033[32m\]\h:\[\033[33;1m\]\w\[\033[m\]\$ "

But instead, should it be:

PS1="\[\033[36m\]\u\[\033[m\]@\[\033[32m\]\h:\[\033[33;1m\]\w\[\033[m\]\$ "
export PS1
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4

In korn shell and bash, you can do it in one line. The original bourne shell required your second syntax, where you set it on one line and then exported it.

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