/usr/share/zsh/help/export is in zsh-common 5.1.1-1ubuntu2.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | export [ name[=value] ... ]
The specified names are marked for automatic export to the envi-
ronment of subsequently executed commands. Equivalent to type-
set -gx. If a parameter specified does not already exist, it is
created in the global scope.
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