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Umask and system commands in Linux|if config network commands|

Umask and system commands in Linux|if config network commands|

umask is a variable available per linux system user based on which his files/folder permissions

will be assigned by default,default umask value is 0002.

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user/system commands

whoami = gives you current user of the machine

logname = current user of the machine.

who = shows all the users currently accessing the machine 

users = only gives space separated usernames currently logged in.

uname = operating system name

uname -a = gives full details of the operating system.

hostname = gives name of the computer

hostname -i = ip address

ls -l | more = displays by page the list of files.

man command-name = man stands for manual and can get information about any linux command.

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networking commands

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sudo apt-get install -y net-tools = install net-tools package for using ifconfig command

ifconfig = displays the ip address and network adapter information.

ping serverName = checks the communication line between client and the server and rate of transmission.

free -h : will show you system storage details like free space total size of disk

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