linux - How do I list the output of ps -U root -u root -eo pid in a single line seperated by comma's -

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when execute cmd ps -u root -u root -eo pid output in multiple lines

eg: 1 2 3 4

i see output in 1 line 1,2,3,4,5 ...

one possible way 

ps -u root -u root -eo pid | tr -s "\n" ","

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