Linux常用shell-作业题目解答

文件创建

1.创建f文件夹命名为mydir

2.进入文件夹，创建一个文件，命名为myfile

3.查看mydir文件夹下有哪些文件

命令

[tsj@VM-16-4-centos~]$Is

[tsj@VM-16-4-centos~]$mkdirmydir#创建一个文件夹命名为mydir

[tsj@VM-16-4-centos~]$cdmydir

[tsj@VM-16-4-centosmydir]$Is

[tsj@VM-16-4-centosmydir]$touchmyfile

[tsj@VM-16-4-centosmydir]$Is

myfile

[tsj@VM-16-4-centosmydir]$

截图

|[tsj0VM-16-4-centos-]$Is

[tsj@VM-16-4-centos~]$mkdirmydir

[tsj@VM-16-4-centos~]$cdmydir

[tsj@VM-16-4-centosmydir]$Is

[tsj@VM-16-4-centosmydir]$touchmyfile

[tsj@VM-16-4-centosmydir!$Is

myfile

[tsj@VM-16-4-centosmydir!$|

文件备份

1.备份mydir文件夹，并命名为mydir.bak

2.讲入mydir.bak选择历史命令杳看mydir.bak下的有哪些文件

[tsj@VM-16-4-centos~]$cp-rnydir/mydir.bak

[tsj@VM-16-4-centos~]$cdmydir.bak/

[tsj@VM-16-4-centos~]$history

[tsj@VM-16-4-centosmydir.bak]$Is

myfile

截图

[tsj@VM-16-4-centos~]$cp-rmydir/mydir.bak

[tsj@VM-16-4-centos~]$cdmydir.bak/

[tsj0VM-l6-4-centosmydir.bak]$Is

nyfile

[tsj@VM-16-4-centosmydir.bak]$|

删除&编辑文件

1.删除mydir下的myWe文件

2.新建一个mybash.sh的文件

3.使用vim编辑mybash.sh文件，使其功能为每隔1s打印一下1到1000的计数，编

辑完毕保存。

4.展示mybash.sh里的内容

命令

[tsj@VM-16-4-centosmydir]$rmmyfile

[tsj@VM-16-4-centosmydir]$vimmybash.sh

ltsj@VM-16-4-centosmydirj$catmybash.sh

foriinseq1000,

do

echo$i

sleep1

done

[tsj@VM-16-4-centosmydir]$

截图

[tsj@VM-16-4-centosmydir]$rmmyfile

[tsj@VM-16-4-centosmydir]$vimmybash.sh

[tsj@VM-l6-4-centosmydir]$catmybash.sh

foriin'seq1000'

do

echo$i

sleep1

done

[tsj@VM-16-4-centosmydir]$■

查看磁盘占用

1.杳看机器总体磁盘占用情况

2.查看mydir所在目录下有哪些文件和文件夹，以及各个文件和文件夹占用磁盘空间大小

命令

[tsj@VM-16-4-centosmydir]$df-h

FilesystemSizeUsedAvailUse%Mountedon

devtmpfs1.9G01.9G0%/dev

tmpfs1.9G28K1.9G1%/dev/shm

tmpfs1.9G692K1.9G1%/run

tmpfs1.9G01.9G0%/sys/fs/cgroup

/dev/vdal79G8.7G67G12%/

tmpfs379M0379M0%/run/user/0

tmpfs379M0379M0%/run/user/1004

[tsj@VM-16-4-centosmydir]$du-sm

1mybash.sh

[tsj@VM-16-4-centosmydir]$cd..

[tsj@VM-16-4-centos~]$du-sm*

1mydir

1mydir.bak

[tsj@VM-16-4-centos~]$

截图

3

4

5

6

7

8

AC[tsj@VM-16-4-centosmydir]$nohup./mybash.sh&

[1]9191

[tsj@VM-16-4-centosmydir)$nohup:ignoringinputandappendingoutputto

'nohup.out'

[tsj@VM-16-4-centosmydir]$tail-fnohup.out

1

2

3

4

5

6

7

8

AC

[tsj@VM-16-4-centosmydir]$

截图

(tsj@VM-16-4-centosmydir]$11

total4

-rw-rw-r--1tsjtsj47Feb2722:51mybash.sh

[tsj@VM-16-4-centosmydir]$chmod700mybash.sh

(tsj@VM-16-4-centosmydir]$11

total4

rwx1tsjtsj47Feb2722:51mybash.sh

[tsj@VM-16-4-centosmydir]$./mybash.sh

)

3

4

5

6

一

R

AC(tsjevM-16-4-centosmydir]$nohup./mybash.sh&

(1]9191

[tsj@VM-16-4-centosmydir]$nohup:ignoringinputandappendingoutputto

'nohup.out*

(ts]@VM-16-4-centosmydir]$tail-fnohup.out

-

3

4

5

6

7

8

[tsi@VM-16-4-centosmydir]$

定时

1.为了防止日志堆积，定时每2min清除nohup.out的日志文件中的日志内容

[tsj@VM-16-4-centosmydir]$crontab-I

*/2****cat/dev/null>~/mydir/nohup.out

进程

1.观察mybash脚本运行实时占用的cpu和内存

2.找到正在运行的mybash所在讲程的pid

3.kill掉该进程，并再次确认进程是否kill掉

命令

[tsj@VM-16-4-centosmydir]$top-p15367

[tsj@VM-16-4-centosmydir]$ps-ef|grepmybash

tsj153674032023:17pts/100:00:00/bin/sh,/mybash.sh

tsj157254032023:18pts/100:00:00grep-color=automybash

[tsj@VM-16-4-centosmydir]$kill15367

[1]+Terminatednohup,/mybash.sh

[tsj@VM-16-4-centosmydir]$ps-ef|grepmybash

tsj161904032023:20pts/100:00:00grep-color=automybash

截图

[tsj@VM-l6-4-centosmydir]$ps-ef|grepmybash

tsj153674032023:17pts/100:00:00/bin/sh./：ybash.sh

tsj157254032023:18pts/100:00:00grep--color=automybash

[tsj@VM-16-4-centosmydir]$kill15367

[1]+Terminatednohup./mybash.sh

[tsj@VM-16-4-centosmydir]$ps-efIgrepmybash

tsj161904032023:20pts/100:00:00grep--color=automybash

(tsj@VM-16-4-centosmydir]$|

shellscript

1.编写一个shell脚本，统计当前用户最常用的指令及其对应的历史使用次数，输出最常使

用的前5

个指令及使用次数，格式为“指令次数"，例如：

命令

[tsj@VM-16-4-centos~]$history|awk'{print$4}'|sort|uniq-c|sort-nr