Day-4: Server management, download, checkOS and services

1. to start any service in linux there have 2 ways service and systemctl:

$ sudo service SERVICENAME start         [service name like httpd,mySQL etc]
$ sudo systemctl start SERVICENAME

1. to stop any service in linux :

$ sudo service SERVICENAME stop
# sudo systemctl stop SERVICENAME

1. restart any stop service again :

$ sudo service SERVICENAME restart
$ sudo systemctl restart SERVICENAME 

1. to check any service up and running or not :

$ sudo service SERVICENAME status
$ sudo systemctl status SERVICENAME
$ sudo systemctl is-active SERVICENAME 
$ sudo systemctl show SERVICENAME

here is all download related linux command :

1. install some software we use apt and yum here all yum command for RPM like centOS, alpine etc:

$ sudo apt install AppName
$ sudo yum install appName

1. remove any app from your local linux machine :

$ sudo apt remove appName
$ sudo yum erase appName

1. get update and upgrade:

$ sudo apt update 
$ sudo apt upgrade
$ sudo yum update 

1. get any install package info:

$ sudo apt show appName
$ sudo yum info appName

1. download something from remote server or internet we use curl and wget:

$ curl downloadLink        [curl https://www.baeldung.com/] {curl show output in console}
$ wget downloadLink        [wget https://www.baeldung.com/] {wget download it into a file}

1. to compress a file in linux by .gz extention:

$ gzip myCompressFile

1. to decompress a file in linux from .gz extended file:

$ gunzip myfileName.gz

1. tar file with .tar extention :

$ tar cvf mytarFile.tar myDestinyFile      [here cvf's c stand for create]
$ tar xvf mytarFile.tar                    [here xvf's x stand for extract]

1. dpkg and rpm:

$ dpkg -i some_deb_ubuntu_package.deb   [for install debian and ubuntu package file]
$ rpm -i some_centOs_alpine_rpm_package.rpm    [for install redhat package file]
$ dpkg -r some_deb_ubuntu_package.deb    [remove file]
$ rpm -e some_centOs_alpine_rpm_package.rpm   [remove file]

1. list install packages in ubuntu debian and redhat:

$ dpkg -l       [for ubuntu and debian]
$ rpm -qa       [for red hat centOS,alpine ]