显示二进制文件的命令是? a. od, i \' _ i9 y. W
b. vil& ^1 x! `4 I/ N; r8 Q/ T# u
c. view
T. d _" q1 E. {0 I) `; |6 [2 P; d d. binview, @2 M. b' ~3 o( V- b" Q# j" F! f9 A
如何显示linux系统中注册的用户数(包含系统用户)?6 Z% Z) [; {* ^. D
a. account -l
" D+ Q" w7 y9 N: X! A% o% J b. nl /etc/passwd |head+ `/ H! G, [7 T$ K
c. wc --users /etc/passwd' k* `, L {; |3 ?# o8 C3 e2 c
d. wc --lines /etc/passwd- N1 Q) J$ n+ u0 o" A' Z7 @
在一行结束位置加上什么符号,表示未结束,下一行继续?
/ K6 c$ i* p3 j n6 j: P a. /- ]: `% M* ^7 R1 m/ d4 d
b. \
$ @; d" {- X- M& v% } c. ;
* x. ~- @2 h8 _' i' S7 E+ A& e d. |
, G1 h8 O3 o z9 ] 命令 kill 9 的含义是:3 O6 _# r' L, H! n# l! b6 o/ W
a. kills the process whose pid is 9. Q" s0 c/ d7 F9 i8 z
b. kills all processes belonging to uid 9.+ Y ^ b* B0 K
c. sends sigkill to the process whose pid is 9." r: V H! U0 y3 P1 X# k. D
d. sends sigterm to the process whose pid is 9.
' v F" m" P4 J8 I* h6 ]0 | 如何删除一个非空子目录/tmp?
$ ^* |% G. V' `5 D5 p a. del /tmp/* B5 a+ b/ j# }8 P+ p# ^0 b
b. rm -rf /tmp
# I# B _7 K; R9 B8 ? c. rm -ra /tmp/*
9 h: ~1 @1 ~, z" O# ?* T d. rm -rf /tmp/*3 w0 w4 A, _9 e" T% h
使用什么命令可以在今天午夜运行命令 cmd1 ?
/ I6 y/ Z" c0 V' D7 q6 E e# d a. at midnight cmd1
& Z4 E4 Z7 v4 `( \ b. cron -at "00:00" cmd1
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c. batch -t "00:00" d. echo "cmd1" | at midnight |