who

Today's Command is "who":

Description:


This command will show the information about users who are currently logged on.

Procedures to use it -

This command has a great use for finding out the information of currently logged on users. The syntax of the command has sown below:

who [OPTION]... [ FILE | ARG1 ARG2 ] 

By default (without any option) 'who' prints the login name, terminal line, login time and the remote hostname. If FILE is not specified, use /var/run/utmp. /var/log/wtmp as FILE is common.

cat

Today's Command is "cat":


What will it do:

This command will display the contents of a single file, or concatenate (ie. join end-to-end) the contents of multiple files and display the result.

How to use it:

The most common and simple thing to do with 'cat' is to display the contents of a file on the standard output device, ie. the terminal. We assume that there is a file named 'foo.txt' in the user's home directory.

tar

Today's Command is "tar":


What will it do:

This command will archive a bunch of your files or directories.

How to use it:

Let us first see how to create an uncompressed archive. We assume that there is a directory named 'foo' inside the user's home directory, and we decide to name the new archive 'foo.tar'
user@box ~$ tar -cf foo.tar foo/

Once the archive is created, we can list the files and directories inside it using the following command.

cd

Today's Command is "cd":


What will it do:

This command is used to change the current working directory.

How to use it:

user@box ~$ cd /tmp

The above command will change the current working directory to '/tmp'. If you look at the prompt you will see that we were in the user's home directory, indicated by '~', while issuing the command.

user@box /tmp$ cd ..

The above command will take you to the immediate parent of the current working directory. In this example it would take you to '/'.

ls

Today's Command is "ls":


What will it do:

This command is used to list the contents of a directory, or for seeing detailed information about a particular file.

How to use it:

user@box ~$ ls

The above command will display all the files and sub-directories contained in the current directory, which is right now the user's home directory indicated by '~'.

The next step is to look at the contents of a directory, which is not the current one.

mv

Today's Command is "mv":


What will it do:

This command is used to rename files and directories; and to move files and directories from one place to another. Moving in this case refers to the act of copying something from one place to another and deleting the older original or source copy.

How to use it:

user@box ~$ mv foo bar

The above command will rename the file or directory named 'foo' in the user's home directory (~ is a an abbreviation for the home directory) to 'bar'.

Tutorials

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uname

Today's Command is "uname":

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