:dirand remote execution
:file header argument can be used to specify the path to the
:dir specifies the default directory during code block
execution. If it is absent, then the directory associated with the current
buffer is used. In other words, supplying
:dir path temporarily has
the same effect as changing the current directory with M-x cd path RET, and
then not supplying
:dir. Under the surface,
:dir simply sets
the value of the Emacs variable
:dir, you should supply a relative path for file output
:file myfile.jpg or
:file results/myfile.jpg) in which
case that path will be interpreted relative to the default directory.
In other words, if you want your plot to go into a folder called Work in your home directory, you could use
#+BEGIN_SRC R :file myplot.png :dir ~/Work matplot(matrix(rnorm(100), 10), type="l") #+END_SRC
A directory on a remote machine can be specified using tramp file syntax, in which case the code will be evaluated on the remote machine. An example is
#+BEGIN_SRC R :file plot.png :dir /firstname.lastname@example.org: plot(1:10, main=system("hostname", intern=TRUE)) #+END_SRC
Text results will be returned to the local Org mode buffer as usual, and file output will be created on the remote machine with relative paths interpreted relative to the remote directory. An Org mode link to the remote file will be created.
So, in the above example a plot will be created on the remote machine, and a link of the following form will be inserted in the org buffer:
Most of this functionality follows immediately from the fact that
sets the value of the Emacs variable
default-directory, thanks to
tramp. Those using XEmacs, or GNU Emacs prior to version 23 may need to
install tramp separately in order for these features to work correctly.
:diris used in conjunction with
:session, although it will determine the starting directory for a new session as expected, no attempt is currently made to alter the directory associated with an existing session.
:dirshould typically not be used to create files during export with
:exports both. The reason is that, in order to retain portability of exported material between machines, during export links inserted into the buffer will not be expanded against
default directory. Therefore, if
default-directoryis altered using
:dir, it is probable that the file will be created in a location to which the link does not point.