Tutorial_scripts.txt
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Tutorial_scripts.txt
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			Using pNbody with scripts
			**********************


			In addition to using pNbody in the python interpreter,
			it is very useful to use pNbody in python scripts. Usually a python script
			begin by the line #!/usr/bin/env python and must be executable::

			chmod a+x file.py

			The following example (slice.py), we show how to write a script that opens a gadget file,
			select gas particles and cut a thin slice

			.. math:: -1000<y<1000

			The new files are saved using the extension .slice. ::

			#!/usr/bin/env python

			import sys
			from pNbody import *

			files = sys.argv[1:]

			for file in files:
			print "slicing",file
			nb = Nbody(file,ftype='gadget',pio='yes')
			nb = nb.select('gas')
			nb = nb.selectc((fabs(nb.pos[:,1])<1000))
			nb.rename(file+'.slice')
			nb.write()

			In your ``pnbody_example`` directory, you can run this script with the command::

			./scripts/slice.py gadget_z*0.dat

			or::

			python ./scripts/slice.py gadget_z*0.dat