Mostly path name updates

man/man1/cat.1

@@ -63,9 +63,9 @@ for each line of input, which can be helpful when
 preparing input to programs that expect line-at-a-time data.
 It never reads any more data from the input than it prints to the output.
 .SH SOURCE
-.B /sys/src/cmd/cat.c
+.B /usr/local/plan9/src/cmd/cat.c
 .br
-.B /sys/src/cmd/read.c
+.B /usr/local/plan9/src/cmd/read.c
 .SH SEE ALSO
 .IR cp (1)
 .SH DIAGNOSTICS