command alias p/x

[Stark1937]

hi,i see the command alias like
command alias reload_lldbinit command source ~/.lldbinit.

now I'd like to
command alias 1 p/x $x1
.....

but it note:
error: invalid command given to 'command alias'. 'p/x $x1' does not begin with a valid command. No alias created.

can you help me?