[NTG-context] \ifshellescape

[Hans Hagen]

Mojca Miklavec wrote:
> On 12/26/06, Hans Hagen wrote:
>   
>> core-job.tex:\ifx\pdfshellescape\undefined \else
>> core-job.tex:    \chardef\systemcommandmode \ifcase\pdfshellescape
>> \plusone \else \plustwo \fi
>>
>> so \systemcommandmode is your friend
>>     
>
> What exactly is the advantage of using \pdfshellescape over \ifeof18
> as the basis of \systemcommandmode? The second one works in XeTeX as
> well while the first is only good for pdfTeX, but perhaps there are
> other reasons for using it.
>
>   
write 18 is a hack and pdfshellescape a sane replacement

in luatex it will probably be gone completely since there we have

\directlua 0 { os.execute("...") }

Hans