[ROOT] What is the command to save a ps file?

From: Kai Yi (yik@fnal.gov)
Date: Thu Jun 14 2001 - 01:05:02 MEST 

Hi, all experts,
    I made a script file to project several 1D hist from a ntuple, between
these hist script, I want a command to save this hist to a ps or gif
file.(I can do it from the menu, but it is better if I can find a command
to put it in my script file).
Thanks in advance!

Kai Yi

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