Hi, The manual page for dc(1) is very careful about signalling which commands are non-portable extensions, with the exception of the `e' command, which is a more recent addition.
Index: dc.1 =================================================================== RCS file: /cvs/src/usr.bin/dc/dc.1,v retrieving revision 1.30 diff -u -p -r1.30 dc.1 --- dc.1 23 Feb 2017 06:40:17 -0000 1.30 +++ dc.1 26 Oct 2017 04:44:01 -0000 @@ -189,6 +189,7 @@ The top value on the stack is duplicated Equivalent to .Ic p , except that the output is written to the standard error stream. +This is a non-portable extension. .It Ic f All values on the stack are printed, separated by newlines. .It Ic G Regards, kshe
