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<{{cmd>|ifeof18</cmd> }} works with both pdfTeX and XeTeX, while <{{cmd>|pdfshellescape</cmd> }} only works with pdfTeX.
Text replacement - "</cmd>" to "}}"
'''MikTeX 2.5/2.6'''
Each application now has it's its own configuration file. To enable <code>write18</code> run
initexmf --edit-config-file=miktex\config\pdftex.ini
or (if you have MikTeX 2.5 or a version of ConTeXt from 2006)
and put
EnableWrite18=t
into it. An alternative is to se set the environment variable <code>MIKTEX_ENABLEWRITE18=t</code>.
=== Windows/Linux/Mac - TexLive ===
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.
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== See also ==
* [[executesystemcommandExecutesystemcommand]]
[[Category:Installation]]