Abstract

Developers must have Linux common commands, master these commands absolutely enough, based on CenterOS7.6.

System Service Management

systemctl

  • Output the status of each service in the system:
systemctl list-units --type=service
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  • View the running status of the service:
systemctl status firewalld
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  • Service shutdown:
systemctl stop firewalld
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  • Start the service:
systemctl start firewalld
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  • Restarting the service (whether the current service is up or down) :
systemctl restart firewalld
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  • Reload configuration information without interrupting service:
systemctl reload firewalld
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  • Forbid automatic startup of services upon startup:
systemctl disable firewalld
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  • Set service startup:
systemctl enable firewalld
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File management

ls

List all files under the current directory (/) :

ls -l /
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pwd

Gets the absolute path to the current working directory

cd

Change the current working directory:

cd /usr/local
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date

Display or modify system time and date;

date '+%Y-%m-%d %H:%M:%S'
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passwd

Used to set user password:

passwd root
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su

Change user identity (switch to superuser) :

su -
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clear

Clear screen information

man

Displays help information about the specified command:

man ls
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who

  • Query the operating level of the system:
who -r
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  • Display the current users logged into the system:
who -buT
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free

Display system memory status (in MB) :

free -m
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ps

Displays the running status of system processes:

ps -ef
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View the running status of the SSHD process:

ps -ef | grep sshd
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top

View live active processes, similar to Windows task Manager

mkdir

Create a directory

more

Page View when a file is too long 10 lines per page View the boot.log file

more -c -10 /var/log/boot.log
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cat

View the Linux startup log file file with the line number:

cat -Ab /var/log/boot.log
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touch

Create text.txt file:

touch text.txt
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rm

  • Delete file:
rm text.txt
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  • Forcibly delete a directory and its subdirectories:
rm -rf testdir/
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cp

Copy the test1 directory to the test2 directory

cp -r /mydata/tes1 /mydata/test2
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mv

To move or overwrite a file:

mv text.txt text2.txt
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Compression and decompression

tar

  • Archive files from the /etc folder into the /etc/tar file (which does not compress) :
tar -cvf /mydata/etc.tar /etc
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  • Use gzip to compress files in /etc to /etc/tar. gz:
tar -zcvf /mydata/etc.tar.gz /etc
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  • Use bzip2 to compress /etc into /etc/tar. bz2:
tar -jcvf /mydata/etc.tar.bz2 /etc
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  • Paging to view the contents of the compressed package (gzip) :
tar -ztvf /mydata/etc.tar.gz |more -c -10
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  • Unzip files to current directory (gzip) :
tar -zxvf /mydata/etc.tar.gz
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Disk and network management

df

Viewing disk space usage:

df -hT
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dh

Check the size of files and folders in the current directory:

du -h --max-depth=1 ./*
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ifconfig

Displays the status of the current network interface

netstat

  • View the current route information:
netstat -rn
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  • To view all valid TCP connections:
netstat -an
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  • To view the listening service enabled in the system:
netstat -tulnp
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  • View information about connected system resources:
netstat -atunp
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wget

Download files from the network

Software installation and management

rpm

  • The installation package is RPM -ivh nginx-1.12.2-2.el7.x86_64. RPM
  • Fuzzy search package: RPM – qa | grep nginx
  • Exact find package: RPM -qa nginx
  • To query the installation path of the software package, run RPM -ql nginx-1.12.2-2.el7.x86_64
  • View the general information about the software package: RPM -qi nginx-1.12.2-2.el7.x86_64
  • Verify that the software package is the same as the installation file: RPM -v nginx-1.12.2-2.el7.x86_64
  • Update package RPM -uvh nginx-1.12.2-2.el7.x86_64
  • To delete the software package, run RPM -e nginx-1.12.2-2.el7.x86_64

yum

  • Yum install nginx
  • Check packages that can be updated: yum check-update
  • Yum update nginx
  • Find package information in the repository: yum info nginx*
  • Yum Info Installed lists all packages installed: yum Info Installed
  • Yum list nginx* yum list nginx*
  • Yum Search Nginx

The public,

Mall project full set of learning tutorials serialized, attention to the public number the first time access.