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proc(3): the args file is writable, not read only (thanks qrstuv)

--- a/sys/man/3/proc

+++ b/sys/man/3/proc

@@ -136,10 +136,13 @@

 .IP \-

 the base and current scheduling priority, each 11 character numbers

 .PP

-The read-only

+The

 .B args

 file contains the arguments of the program when it was created by

 .IR exec (2).

+Writing to the

+.B args

+file will overwrite its contents.

 If the program was not created by

 .BR exec ,

 such as by