! <shell command> ... `<shell command>` ...
Shell commands can be executed within Pyxplot by prefixing them with pling (!) characters, as in the example:
As an alternative, back-quotes (‘) can be used to substitute the output of a shell command into a Pyxplot command, as in the example:
set xlabel `echo "'" ; ls ; echo "'"`
Note that back-quotes cannot be used inside quote characters, and so the following would not work:
set xlabel '`ls`'