Can soneone explane me what is variable in Linux ? what does it mean ? and what does it do ? what is the difference between variable and command ?
Thank you

Environment variable; the ones like PATH, XMODIFIERS, PKG_CONFIG_PATH. The ones with capital letters. They are set to certain values. You can view them with echo $VARIABLE_NAME e.g. "echo $PATH".

Command; there are build-in commands in bash and programs. The build in ones are like ls, ln, cd etc. Programs can be induced through bash by giving command, such as mplayer, rename, man etc. As far as I understand when you type "man name_of_build_in_command", it would not return man page, but will list down build-in commands instead. Whe you "man program_name", then it will give you some manual for that program.

Hopefully these will give you some clue.

"Can soneone explane me what is variable in Linux ?"

A variable is a name that contains some useful information. An example of a variable is PATH which contains the names of the directories where Linux looks for the commands that you execute. You can display any variable with the echo command:
echo $PATH
echo $HOME

You can create a variable with the export command:
export MYNAME=Uchiha
echo $MYNAME

Variables do not have to be capitalized but most people do that to distinguish variables from commands.

A command starts a program. echo is a program, so are mozilla, export, mount, and thousands of others.

Commands are usually small letters to distinguish them from variables.

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Steve Stites

Thanks alot , now it makes more sense