Unix&Linux大学教程(08):能够立即使用的程序

1.which 哪里的程序会执行

appledeMacBook-Air:~ apple$ which date
/bin/date
appledeMacBook-Air:~ apple$ which date less vi emacs
/bin/date
/usr/bin/less
/usr/bin/vi
/usr/bin/emacs
appledeMacBook-Air:~ apple$ 

2.type which的备用指令

appledeMacBook-Air:bin apple$ type date
date is /bin/date
appledeMacBook-Air:bin apple$ type date less vi emacs
date is /bin/date
less is /usr/bin/less
vi is /usr/bin/vi
emacs is /usr/bin/emacs
appledeMacBook-Air:bin apple$ 

3.date -u 格林尼治标准时间

appledeMacBook-Air:bin apple$ date
201888日 星期三 191355CST
appledeMacBook-Air:bin apple$ date -u
201888日 星期三 111416UTC
appledeMacBook-Air:bin apple$  

4.cal 日历

cal [-j][month][year]: 第几天选项、月份选项、年份选项
appledeMacBook-Air:bin apple$ cal
     八月 2018
日 一 二 三 四 五 六
          1  2  3  4
 5  6  7  8  9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30 31

appledeMacBook-Air:bin apple$ 

5.查看系统信息

uptime : 开机时间
hostname : 计算机名称
uname : 操作系统名称
uname -a : 操作系统详细信息
appledeMacBook-Air:bin apple$ uptime
19:24  up 2 days, 5 mins, 2 users, load averages: 1.01 1.11 1.11
appledeMacBook-Air:bin apple$ hostname
appledeMacBook-Air.local
appledeMacBook-Air:bin apple$ uname
Darwin
appledeMacBook-Air:bin apple$ uname -a
Darwin appledeMacBook-Air.local 15.6.0 Darwin Kernel Version 15.6.0: Tue Jan  9 20:12:05 PST 2018; root:xnu-3248.73.5~1/RELEASE_X86_64 x86_64
appledeMacBook-Air:bin apple$ 

6.查看用户信息

whoami : 用户名称
quota : 可以使用的内存空间
users : 所有用户标识
who : 所有用户详细信息
w : 所有用户在做什么
appledeMacBook-Air:bin apple$ whoami
apple
appledeMacBook-Air:bin apple$ quota
Disk quotas for user apple (uid 501): none
appledeMacBook-Air:bin apple$ users
apple
appledeMacBook-Air:bin apple$ who
apple    console  Aug  6 19:20 
apple    ttys000  Aug  8 19:07 
appledeMacBook-Air:bin apple$ w
19:29  up 2 days, 9 mins, 2 users, load averages: 1.45 1.36 1.22
USER     TTY      FROM              LOGIN@  IDLE WHAT
apple    console  -                一19   2days -
apple    s000     -                19:07       - w
appledeMacBook-Air:bin apple$ 

这里写图片描述
7.leave 设置闹钟

appledeMacBook-Air:~ apple$ leave 
When do you have to leave? 112
Alarm set for 201889日 星期四 011200CST. (pid 1473)
appledeMacBook-Air:~ apple$ leave +20
Alarm set for 201888日 星期三 200124CST. (pid 1475)
appledeMacBook-Air:~ apple$ 

8.bc -l 启用科学计算器

appledeMacBook-Air:~ apple$ bc -l
bc 1.06
Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'. 
12 + 24
36
10 + 10;12+12
20
24
2^3
8
sqrt(16)
4.00000000000000000000

这里写图片描述

设置小数位

sqrt(16)
4.00000000000000000000
scale
20
scale=3
3/2
1.500

使用变量

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x=10
x
10
x+12
22

设置进制

obase
10
ibase
10
obase=2;ibase=16
AB
10101011

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转载自blog.csdn.net/weixin_42480750/article/details/81513897