单项选择题
A. locate
B. which
C. find
D. query
E. whereis
单项选择题 Whichofthesecommandsallowsyoutousesharedlibrariesthatarein/usr/local/lib？（）
单项选择题 Usingvi，youwanttosavechangestothefilemyfilewith：w!，butvicomplainsitcannotwritetothefile.Therefore，youwanttocheckthewritepermissionsonthefile.Todothiswithoutleavingvi，youtype：（）
单项选择题 YouwishtokillaprocesswithaPIDof123.Selectthecommandwhichexiting.（）