Frequently used Linux or CentOS commands

I got to know some important but initial  CentOS commands, which frequently used with LINUXCentOS  servers.

So i collected some of them with examples, since its not exact list by any means but should give a jumpstart on some of the common Linux + CentOS commands.

//Common used phrase "yum" means:'Yellowdog Updater Modified'.

//List of updated software (security fix):
'#yum list updates'

//See Installed Packages:
'#yum list installed'

//Check installed module/package's version: 
'#<Package Name> -v'
Example: To check installed mysql version:'#mysql -v'

//Switch User:
'#su -' OR '#su - <user Name>' OR '#su root'
//To become the root user: '#su - root'
//If username not mentioned so byDefault root user is assumed,
//In-such case command shortened to: '#su -' or '#su'

//Search for any Installed Package:
'#yum list <package-name>'
Example:  '#yum list php' - show info for php package.

//Get Full package info of Installed Package:
'#yum info <PackageName>'
Example: '#yum info php - show full ver. of php package.

//Grep command: Search command
'#grep  <switch> <Search Name>'

//Grep With custom Switch:
'# rpm -qa | grep php'  -   Pipe | used for transfer output of rpm command to grep command.
//RPM(Redhat Package Manager):  Installs already configured and compiled software on system/server.

//Search Any Package on MirrorsRepository:
'#yum search <Package Name>'
Example: '#yum search bcmath'  -  Search All bcmath Package available on Mirrors / Repository.

//Install Package:
'#yum install <Package Name>'
Example: '#yum install php-bcmath' - Install php-bcmath package/module.

//Remove package:
'# yum remove <PackageName>'
Example: '#yum remove mysql' - Will remove mysql package.

//Connect Via SSH:
'#ssh <USER><HOST>'
Example: '#ssh [email protected]'

//List Command:
'#ls' - List all files & folders on current working directory.
Example: '#ls -al' - Show all files include hidden ones, with all attributes associate with.

//Present Working Directory:
'#pwd' - Show Current working directory.
Example: '#pwd' - w'll output like : /Users/Chandan-Bora/desktop

//Manual Pages:
'#man  <Command Name>' - Show MANUAL for specific command.
Example: '#man ls'
Output will like:
ls -- list directory contents

ls [[email protected]] [file ...]

//Copy File:
'#cp <Source File with Path> <Destination File with Path>'
Example:  '#cp home/Chandan-Bora/Desktop/info.php var/www/html/'
- Copy "info.php" from desktop to 'www folder'.

//Ping Command:
'#ping <Switch><URL OR IP>'
Example:'#ping', Custom switches are also available.
For more on Ping and switches, visit link.

Did i miss any other common command ?  just let me know, i’ll keep update above list.” 🙂

Let me know, in-case mentioned command’s Syntax/Manual needs update.

Chandan Bora

I am a Web Coder/Tech Lead with very basic skills-set of writing. Love to do frequent research on web security, digital trends & technologies. You can connect me on Twitter @ChandanBora_.

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