单项选择题 While using the smit install_remove menus to remove some filesets on an AIX 5.3 server， a system administrator notices the /usr filesystem is now unnecessarily large.  Which of the following actions will reduce the size of the /usr filesystem （）

单项选择题 Given the following script， why does the output come out as an empty line instead of "dog"（）#!/bin/ksh  $VAR=dog  echo "${VAR}"

单项选择题 Whichofthefollowingcommandswouldanadministratorusetoaddstartupscriptstothesystemstartupprocess（）