针对当前热议的linux常用的20个命令是什么？话题，我们进行了深入调研和信息整合，力求为您呈现全面客观的内容分析。
1、ls命令
ls命令是列出目录内容(List Directory Contents)的意思。运行它就是列出文件夹里的内容，可能是文件也可能是文件夹。
2、lsblk命令
"lsblk"就是列出块设备。除了RAM外，以标准的树状输出格式，整齐地显示块设备。
3、查看一个程序是否运行
ps –ef|grep tomcat //查看所有有关tomcat的进程
4、终止线程
kill -9 19979 //终止线程号位19979的线程
5、查看文件，包含隐藏文件
ls -al
6、当前工作目录
pwd
7、创建目录
mkdir newfolder
8、删除目录（此目录是空目录）
rmdir deleteEmptyFolder
9、删除文件包括其子文件
rm -rf deleteFile
10、移动文件
mv /temp/movefile /targetFolder//扩展重命名 mv oldNameFile newNameFile
11、切换用户
su -username
12、修改文件权限
chmod 777 file.java //file.java的权限-rwxrwxrwx，r表示读、w表示写、x表示可执行
13、压缩文件
tar -czf test.tar.gz /test1 /test2
14、列出压缩文件列表
tar -tzf test.tar.gz
15、解压文件
tar -xvzf test.tar.gz
16、查看文件头10行
head -n 10 example.txt
17、查看文件尾10行
tail -n 10 example.txt
18、查看日志文件
tail -f exmaple.log //这个命令会自动显示新增内容，屏幕只显示10行内容的（可设置）。
19、启动Vi编辑器
vi
20、查看系统当前时间
date
命令会输出 周几 几月 几日 时间 和 时间显示格式 和年份
Sat Feb 22 15:36:49 CST 2019
date +”%Y-%m-%d”
Angel - Sarah McLachlan
Spend all your time waiting
For that second chance
For a break that would make it okay
There's always some reason
To feel not good enough
And it's hard at the end of the day
I need some distraction
Oh beautiful release
Memories seep from my veins
Let me be empty
And weightless and maybe
I'll find some peace tonight
In the arms of the angel
Fly away from here
From this dark cold hotel room
And the endlessness that you fear
You are pulled from the wreckage
Of your silent reverie
You're in the arms of the angel
May you find some comfort here
So tired of the straight line
And everywhere you turn
There's vultures and thieves at your back
And the storm keeps on twisting
You keep on building the lies
That you make up for all that you lack
It don't make no difference
Escaping one last time
It's easier to believe in this sweet madness oh
This glorious sadness that brings me to my knees
In the arms of the angel
Fly away from here
From this dark cold hotel room
And the endlessness that you fear
You are pulled from the wreckage
Of your silent reverie
You're in the arms of the angel
May you find some comfort here
You're in the arms of the angel
May you find some comfort here
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