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→How to check if write18 is turned on
== How to check if write18 is turned on ==
Sometimes while writings a module, one needs to check if write18 is enabled or nownot. There are different ways in which this can be done.
* A new primitive in pdftex 1.30: <cmd>pdfshellescape</cmd> is a read-only integer that is 1 if <cmd>write18</cmd> is enabled, 0 otherwise.