generalized ggsave to save multiple outputs of ggplot to single file and multiple files from a single call. Plots can be saved to various graphic devices.
#single file output to pdf
gggsave('Rplots.pdf',plot=pList)
#multiple file output to pdf
gggsave('Rplots.pdf',plot=pList,onefile=F)
#multiple file output to png
gggsave('Rplots.png',plot=pList)