多项选择题
A. software to predict the location of installed files and directories
B. software to predict the ownership and access rights to files and directories
C. users to predict the location of installed files and directories
D. users to predict how the filesystem should be formatted according to need
单项选择题 Youarelookingforanexecutablefilefoo.Selectthecommandthatwouldsearchforfoowithindirectoriessetintheshellvariable，PATH.（）
单项选择题 Whichofthesecommandsallowsyoutousesharedlibrariesthatarein/usr/local/lib？（）
单项选择题 Usingvi，youwanttosavechangestothefilemyfilewith：w!，butvicomplainsitcannotwritetothefile.Therefore，youwanttocheckthewritepermissionsonthefile.Todothiswithoutleavingvi，youtype：（）