newbie: vi - go to previous file

[Zhang Weiwu]

Hello. I am using the BSD's vi not vim.

I learned from :exusage that :N is to swich to the next file in argument 
list while :P swich to the previous file. :N woks fine, while :P does 
nothing.

Say, I run ">vi file1 file2", which opens file1, :N begin to edit file2, 
then I press :P, I thought I should go to file1, but I'm still editing 
file2.

Thank you.

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