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→Environment Variables
< [[Installation hints]]
== Overview == This page describes how to apply configure and persist custom configuration changes to default settings for changing default directories, including directory paths. For the purposes of this wiki page, it is assumed that ConTeXt is installed at:
/opt/context
== Default Variables ==
The file `<tt>/opt/context/tex/texmf/web2c/texmfcnf.lua` </tt> contains a number of variables, including:
TEXMFCACHE
Most options in <tt>texmf.cnf</tt> of modern TeX distributions also work with ConTeXt.
== Environment Variables ==
By default, ConTeXt creates a directory named <tt>luatex-cache</tt> in the user's home directory. One way to change the cache location includes:
export TEXMFCACHE=/tmp
mtxrun --generate
context filename.tex
Another way is to run the <tt>context</tt> executable indirectly via <tt>mtxrun</tt>, as follows:
export TEXMFCACHE=/tmp
mtxrun --autogenerate --script mtx-context filename.tex
Running ConTeXt in either of these ways will create <tt>luatex-cache</tt> inside the <tt>/tmp</tt> directory, rather than the user's home directory.
== Security Concerns ==
ConTeXt requires enabling the `write18` function to run [[MetaPost]] and other tools. This implies that malicious TeX code can run any program with user rights. The function is *''disabled* '' by default. This can be enabled by changing the setting inside <tt>texmf.cnf</tt>:
shell_escape = t
# /opt/context/texmf/web2c/texmf.cnf
Variables set in a particular file are *''not* '' overwritten by files that are read later.
The first configuration file listed is useful for system dependent configuration. On
