单项选择题
A.The $VAR variable was not exported
B.The $VAR should have been set as VAR
C.dog needs double quotes around it when setting $VAR
D.The { } should not be around VAR in the echo command
单项选择题 Review the following program. What is the possible problem？（）
单项选择题 Asystemadministratorhasaserverthatisperformingpoorly.ThevmstatcommandidentifiesthathighCPUusageistheproblem.Whichofthefollowingcommandscanbeusedtoidentifytheeightmostactiveprocessesrunningontheserver？（）
单项选择题 Asystemadministratorisunabletounmountafilesystem.Whichistheappropriatecommandtodeterminewhoorwhatisaccessingthefilesystem？（）
