2019-03-20预习笔记

是什么？

在哪里？

为什么用？

 下课用于提问，

上课听课有效率

结论停留表面

1.在当前系统中打印出所有普通用户的用户名和家目录（/etc/passwd）

[root@quyunlong~]# awk -F ":"

'NR==21,NR==22{print $1,$6}' /etc/passwd

oldgirl /home/oldgirl

test /home/test

[root@quyunlong~]#

2.显示当前系统中容量使用率大于5%的文件系统名称和挂载点

[root@quyunlong~]# df -h|awk -F "[

%]+" '$5>5{print $1,$6}'

Filesystem Mounted

/dev/sda3 /

/dev/sda1 /boot

[root@quyunlong~]# df -h|awk -F "[

%]+" '$5>5&&NR==2,NR==3{print $1,$6}'

/dev/sda3 /

devtmpfs /dev

[root@quyunlong~]#

3.为/tmp/grub.conf文件中前三行的行首加#号

[root@quyunlong~]# sed -n '1,3p' n.txt |sed

-n 's#GRUB#\#GRUB#gp'

#GRUB_TIMEOUT=5

#GRUB_DISTRIBUTOR="$(sed 's, release

.*$,,g' /etc/system-release)"

#GRUB_DEFAULT=saved

[root@quyunlong~]#

[root@quyunlong~]# sed -n

'1,3s#GRUB#\#GRUB#gp' n.txt

#GRUB_TIMEOUT=5

#GRUB_DISTRIBUTOR="$(sed 's, release

.*$,,g' /etc/system-release)"

#GRUB_DEFAULT=saved

[root@quyunlong~]#

4.通过notepad++打开，把一下内容输入到test.txt文件中

姓名                          区号   电话    三个月捐款数量

Mike Harrington:[510] 548-1278:250:100:175

Christian Dobbins:[408] 538-2358:155:90:201

Susan Dalsass:[206] 654-6279:250:60:50

Archie McNichol:[206] 548-1348:250:100:175

Jody Savage:[206] 548-1278:15:188:150

Guy Quigley:[916] 343-6410:250:100:175

Dan Savage:[406] 298-7744:450:300:275

Nancy McNeil:[206] 548-1278:250:80:75

John Goldenrod:[916] 348-4278:250:100:175

Chet Main:[510] 548-5258:50:95:135

Tom Savage:[408] 926-3456:250:168:200

Elizabeth Stachelin:[916]

440-1763:175:75:300

(1)显示所有电话号码

[root@quyunlong~]# awk -F ":"

'{print $2}' d.txt

[510] 548-1278

[408] 538-2358

[206] 654-6279

[206] 548-1348

[206] 548-1278

[916] 343-6410

[406] 298-7744

[206] 548-1278

[916] 348-4278

[510] 548-5258

[408] 926-3456

[916] 440-1763

[root@quyunlong~]#

(2)显示Dan的电话号码

[root@quyunlong~]# awk -F ":"

'NR==11{print $2}' d.txt

[406] 298-7744

(3)显示Susan的名字和电话号码

[root@quyunlong~]# awk -F ":"

'NR==5{print $1,$2}' d.txt

Susan Dalsass [206] 654-6279

[root@quyunlong~]#

(4)显示所有以D开头的姓

[root@quyunlong~]# awk '/^D.*/' d.txt

Dan Savage:[406] 298-7744:450:300:275

[root@quyunlong~]# awk '/^D.*/' d.txt |awk

'{print $1}'

Dan

[root@quyunlong~]#

[root@quyunlong~]# sed -rn '11s#(.*)

Sav.*$#\1#gp' d.txt

Dan

[root@quyunlong~]#

(5)显示所有区号为916的人名

[root@quyunlong~]# sed -n '/916/p'

d.txt|awk -F "[: ]+" '{print $2}'

Quigley

Goldenrod

Stachelin

[root@quyunlong~]#

(6)显示Mike的捐款.显示每个值时都有以$开头.如$250$100$175

[root@quyunlong~]# sed -rn'2s#^.*1278(.*)#\1#gp'  d.txt

:250:100:175

[root@quyunlong~]# sed -rn

'2s#^.*1278(.*)#\1#gp' d.txt|tr ":" "$"

$250$100$175

[root@quyunlong~]#

(7)显示姓,其后跟一个逗号和名

[root@quyunlong~]# awk -F ":"

'NR==2,NR==19{print $1}' d.txt |sed -n 's# #,#gp'

Mike,Harrington

Christian,Dobbins

Susan,Dalsass

Archie,McNichol

Jody,Savage

Guy,Quigley

Dan,Savage

Nancy,McNeil

John,Goldenrod

Chet,Main

Tom,Savage

Elizabeth,Stachelin

[root@quyunlong~]#

(8)在Jody开头的行前面添加oldboy

[root@quyunlong~]# sed -n

'8s#Jody#oldboyJody#gp' d.txt

oldboyJody Savage:[206] 548-1278:15:188:150

[root@quyunlong~]#

(9)删除空白行

[root@quyunlong~]# grep "." d.txt

姓名                 区号   电话    三个月捐款数量

Mike Harrington:[510] 548-1278:250:100:175

Christian Dobbins:[408] 538-2358:155:90:201

Susan Dalsass:[206] 654-6279:250:60:50

Archie McNichol:[206] 548-1348:250:100:175

Jody Savage:[206] 548-1278:15:188:150

Guy Quigley:[916] 343-6410:250:100:175

Dan Savage:[406] 298-7744:450:300:275

Nancy McNeil:[206] 548-1278:250:80:75

John Goldenrod:[916] 348-4278:250:100:175

Chet Main:[510] 548-5258:50:95:135

Tom Savage:[408] 926-3456:250:168:200

Elizabeth Stachelin:[916]

440-1763:175:75:300

[root@quyunlong~]#

[root@quyunlong~]# sed -n '/./p' d.txt

姓名                 区号   电话    三个月捐款数量

Mike Harrington:[510] 548-1278:250:100:175

Christian Dobbins:[408] 538-2358:155:90:201

Susan Dalsass:[206] 654-6279:250:60:50

Archie McNichol:[206] 548-1348:250:100:175

Jody Savage:[206] 548-1278:15:188:150

Guy Quigley:[916] 343-6410:250:100:175

Dan Savage:[406] 298-7744:450:300:275

Nancy McNeil:[206] 548-1278:250:80:75

John Goldenrod:[916] 348-4278:250:100:175

Chet Main:[510] 548-5258:50:95:135

Tom Savage:[408] 926-3456:250:168:200

Elizabeth Stachelin:[916]

440-1763:175:75:300

[root@quyunlong~]#

[root@quyunlong~]# awk '/./' d.txt

姓名                 区号   电话    三个月捐款数量

Mike Harrington:[510] 548-1278:250:100:175

Christian Dobbins:[408] 538-2358:155:90:201

Susan Dalsass:[206] 654-6279:250:60:50

Archie McNichol:[206] 548-1348:250:100:175

Jody Savage:[206] 548-1278:15:188:150

Guy Quigley:[916] 343-6410:250:100:175

Dan Savage:[406] 298-7744:450:300:275

Nancy McNeil:[206] 548-1278:250:80:75

John Goldenrod:[916] 348-4278:250:100:175

Chet Main:[510] 548-5258:50:95:135

Tom Savage:[408] 926-3456:250:168:200

Elizabeth Stachelin:[916]

440-1763:175:75:300

[root@quyunlong~]#