illumos gate

MDB lets you pipe the output to a subshell using `!`, as in:

> 1::pid2proc | ::pfiles ! grep -v VNODE | awk '{print $3}' 
ffffff0d468fde00
ffffff0d2c238c80
ffffff0d2c238d80
ffffff0d2c0cc240

Often, you want to send that output back into mdb. You can do that by redirecting to a file and using ::cat:

> 1::pid2proc | ::pfiles ! grep -v VNODE | awk '{print $3}' > foo
> ::cat foo | ::print vnode_t v_path
v_path = 0xffffff0d2c92a768 "/var/run/initpipe" 
v_path = 0xffffff0d2bed6ce0 "/system/contract/process/pbundle" 
v_path = 0xffffff0d2bed6d08 "/system/contract/process/template" 
v_path = 0xffffff0d2bd4dbe8 "/system/contract/process/template" 

But it would be really handy to be able to use a second "!" to send output back into mdb, like so:

> 1::pid2proc | ::pfiles ! grep -v VNODE | awk '{print $3}'  ! ::print vnode_t v_path
v_path = 0xffffff0d2c92a768 "/var/run/initpipe" 
v_path = 0xffffff0d2bed6ce0 "/system/contract/process/pbundle" 
v_path = 0xffffff0d2bed6d08 "/system/contract/process/template" 
v_path = 0xffffff0d2bd4dbe8 "/system/contract/process/template"