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Text replacement - "</cmd>" to "}}"
Sometimes while writings a module, one needs to check if write18 is enabled or not. 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.* ConTeXt defines {{cmd|systemcommandmode</cmd> }} that is 2 if {{cmd|write18</cmd> }} is enabled, 1 otherwise.* A primitive {{cmd|ifeof18</cmd> }} that is <code>true</code> if {{cmd|write18</cmd> }} is disabled, <code>false</code> otherwise.
{{cmd|ifeof18</cmd> }} works with both pdfTeX and XeTeX, while {{cmd|pdfshellescape</cmd> }} only works with pdfTeX.
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