While I still have some doublt for my second question, in which, fffffffecc47e000::array "struct vnode *" 0t2048 p|::eval <p/K|::grep .==0 doesn't work.

swap_vnodes: swap_vnodes: fffffffecb5bc000

fffffffecb5bc000 fffffffecb5bc008 fffffffecb5bc010 fffffffecb5bc018 fffffffecb5bc020 fffffffecb5bc028 fffffffecb5bc030 fffffffecb5bc038 fffffffecb5bc040 fffffffecb5bc048 fffffffecb5bc050 fffffffecb5bc058 fffffffecb5bc060 fffffffecb5bc068 fffffffecb5bc070 fffffffecb5bc078

Use ::grep pipelined with ::eval<p=K can work while with ::eval <p/K doesn't work

.==0 /* this doesn't work */ mdb: syntax error on line 1 of (pipeline) near ":"

fffffffecb5bc000 fffffffecb5bc008 fffffffecb5bc010 fffffffecb5bc018 fffffffecb5bc020 fffffffecb5bc028 fffffffecb5bc030 fffffffecb5bc038 fffffffecb5bc040 fffffffecb5bc048 fffffffecb5bc050 fffffffecb5bc058 fffffffecb5bc060 fffffffecb5bc068 fffffffecb5bc070 fffffffecb5bc078

0xfffffffecb5bc000: 0 0xfffffffecb5bc008: 0 0xfffffffecb5bc010: 0 0xfffffffecb5bc018: 0 0xfffffffecb5bc020: 0 0xfffffffecb5bc028: 0 0xfffffffecb5bc030: 0 0xfffffffecb5bc038: 0 0xfffffffecb5bc040: 0 0xfffffffecb5bc048: 0 0xfffffffecb5bc050: 0 0xfffffffecb5bc058: 0 0xfffffffecb5bc060: 0 0xfffffffecb5bc068: 0 0xfffffffecb5bc070: 0 0xfffffffecb5bc078: 0

Looking at the above output, I guess the reason is the output format, I checked "Solaris Modular Debugger Guide" and on page 32 it says each line in the output before '|' must consist of an arithmetic expression terminated by a NEWLINE or semicolon. So it seems that the reason here is that the output of ::eval <p=K doesn't conform to this thus breaks the pipeline of dcmds. But let's look at the output of /Kn

0xfffffffecb5bc000: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

My two questions here: While /n is added to make sure each expression occupies one line, here the first line does not exactly consist of an arithmetic expression, and it contains the address of the first entry in array, so I would expect it will break the pineline, but instead, it works fine. I am somehow puzzled about this. Could you give me some hint on this? Another question is why the output of /Kn and ::eval <p/K are different? Basically I think the output should be the same as they each takes an address and dump the content one line a time.