Linux Basics : First Steps Into Linux
his file permissions. The initial group
must be a group which already exists.
Password : This will be the user\'s password to access his account
login_name : This will be the user name with which the user will
access his account.
useradd -d /home/einstein -e 2002-08-30 -g root -p relativitysucks
creates a user named einstein on my computer.
His home directory is /home/einstein
His expirty date is 30th august 2002
He belongs to the \'root\' group
His password is relativitysucks
His username is einstein.
Incase you do not enter one of the parameters group, home, expire
or shell they are replaced by their default values. These default values
can be viewed using the \" useradd -D\" command and can also
be changed which however we will cover in a later document.
The ls command
The ls command is equivalent of the DOS
It lists the files and subdirectories contained
within the present directory.
Some possible flags which can be used with the ls command
List all files (Some configuration files starting
with a dot \'.\' are otherwise not listed). Often the number of files in a
directory is too large to be fitted within one screenfull of data.
In such a case we use dir/p for DOS. For linux a similar command is
ls | more
Lists files and directories page after page on
keystroke. The above command actually is a combination of two commands. It
introduces a new concept called \'Piping\'. It is done using the logical
OR or | character found just above the Enter key on your keyboard. In Linux
it is possible to give the output of one command to another command
as an input.The ls command lists files & subdirectories and the more
commands divides its input into page length views. Thus piping the
ls output to more results in page length views of files and subdirectories.
It lists the files and subdirectories of a directory and further lists
the contents of each subdirectory recursively. The output of this
command is usually large and is best seen when piped through more.
The pwd command
The pwd or the present working directory command gives you the path to