My data look like this

y x1 x2 x3 x4
. . . . .
. . . . .
I want to run univariate regressions as y as the dependent variable and x's as the dependent variables (separately). Then I want to save the slope coefficients in a separate file (text or csv) in the following format
x1 slope
x2 slope
x3 slope
x4 slope

How do run several univarite regressions simultaneously and save the output (as indicated above) in SAS. Please indicate the codes if possible. Thanks.