(command.CommandList
  children: [
    (command.Simple
      words: [
        {<xargs>}
        {<perl>}
        {<-n>}
        {<-i>}
        {<-e>}
        {(SQ <'\n'> <'\tprint;\n'> <'\ts/\\$(Id|OpenBSD): [^\\$]*/\\$FreeBSD/ && print;\n'>)}
      ]
      redirects: [(redir op:<Id.Redir_Less '<'> loc:(redir_loc.Fd fd:0) arg:{<keywords>})]
      do_fork: T
    )
    (command.Simple
      words: [
        {<xargs>}
        {<perl>}
        {<-n>}
        {<-i>}
        {<-e>}
        {
          (SQ <'\n'> <'\tprint;\n'> 
            <'\tm/^\\#include "includes.h"/ && print "__RCSID(\\"\\$FreeBSD\\$\\");\\n";\n'>
          )
        }
      ]
      redirects: [(redir op:<Id.Redir_Less '<'> loc:(redir_loc.Fd fd:0) arg:{<rcsid>})]
      do_fork: T
    )
  ]
)