export which is correct syntax

[Tim]

Frank Murphy:
> > 1: export TMPDIR=/var/tmp
> > 2: export TMPDIR=$TMPDIR:/var/tmp

Suvayu Ali:
> Depends on what you want to do.  If you want to overwrite the variable,
> use (1).  If you want to add (prepend) to the variable, use (2).

Wouldn't that actually be an append - add onto the end of the existing
variables, as opposed to insert before the existing variables (prepend).

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