显示二进制文件的命令是?8 q! I7 ?2 R8 Y! k, d6 p# T D8 H
a. od, O/ G9 L" B+ g8 h" T
b. vil1 A: i! J P" V! }
c. view- o2 u( h8 M- L/ W2 W
d. binview; G: @$ r2 N) B5 w: E7 u% w
如何显示linux系统中注册的用户数(包含系统用户)?
' W5 O! ^4 z, X9 u3 m- A3 a6 ?& Qa. account -l
8 z4 t0 b2 {& c, x* C0 G: b# Db. nl /etc/passwd
- g8 H' o1 A8 q9 L& q1 nhead
5 M2 A' [2 \6 ^c. wc --users /etc/passwd
& h0 c2 t+ ~0 x+ r9 j- h% Ld. wc --lines /etc/passwd ; p: g! G2 |( f4 v# n; g: v8 g; e6 b
" O" q/ M# U2 G; v* n在一行结束位置加上什么符号,表示未结束,下一行继续?! j3 k: |: y- v) \+ q, O" i
a. /
& k9 O6 e, q. r4 C/ Rb. \1 ^8 \- u* k, {. k! i
c. ;1 o0 u4 c+ P/ L! o. o' c( m
d. , o: _- z, ?+ z# P/ Q# j
命令 kill 9 的含义是:
) n# Z b4 m) i9 o D( G" la. kills the process whose pid is 9.
! K. U1 {& q: C7 i1 d+ J) Yb. kills all processes belonging to uid 9.
: I9 [2 A+ H' F4 R" j( Lc. sends sigkill to the process whose pid is 9.& z# Z2 S. @1 N8 N
d. sends sigterm to the process whose pid is 9., W7 \# T: }& X- D |% I# D
如何删除一个非空子目录/tmp?1 X+ C, z8 T$ s2 v! B) a1 Q) k# ]1 _7 ^
a. del /tmp/*
' {! [9 [" u; G: Y2 pb. rm -rf /tmp8 m2 C" M+ L& y
c. rm -ra /tmp/*; b4 ?+ L( s2 `9 s+ E- X& D) i8 v
d. rm -rf /tmp/*9 R5 s# |! x7 b& J* V/ J) w T
使用什么命令可以在今天午夜运行命令 cmd1 ?
/ n; e0 E# l3 g* \5 ^# Ta. at midnight cmd1
5 q2 w% w- u# C) M# Q5 ob. cron -at "00:00" cmd1
! [- g2 i7 n. h6 [0 _# i+ ic. batch -t "00:00" d. echo "cmd1" ! d' N a/ u# j6 p. a
d.at midnight |