Linux笔试题,17.WhichvariablepresentstheargumentcountinshellA.$*B.$#C.D.$-E.18.Youwanttofindthefullpathofacertaincommand.Howwouldyoudothis?A.Byusingthe'where'commandB.Byusingthe'path'commandC.Byusingthe'which'

Question

Linux笔试题,
17.Which variable presents the argument count in shell
A.$* B.$# C.D.$- E.
18.You want to find the full path of a certain command.How would you do this?
A.By using the 'where' command
B.By using the 'path' command
C.By using the 'which' command
19.Which of the following can be used to switch your system to run level
A.init 3 B.rlevel 3 C.level 3 D.inittab 3
20.Which of the following directories would be the least likely to need backing up?
Choose Two
A./usr B./etc C./home D./tmp E./swap
21.Which of the following will copy file1.txt to file2.txt?Choose Two.
A.cat file1.txt > file2.txt B.cat file1.txt | file2.txt
C.cp file1.txt > file2.txt D.cp file1.txt file2.txt
E.cpio < file1.txt > file2.txt

Answer 1

17 不懂
18 b 有个命令是 whereis .看安装到哪里去了,是这个吧
19 A 这个命令,你百度去查详情吧,进入图形界面.
20 d e 最不需要备份的文件 显然是 d临时 e不知道是什么了,总是就是没什么用的.
21 d是对的 还有一个不知道 没用过.