is a command use to delete a user profile account.

command is used to Create a group account.

a command use delete an existing Group account.

a command used to add an Existing account to an existing group account

You can also display the list of user and group accounts Using terminal just simply press __ to switch on Single user text mode terminal.

this command is used to assign a password for the user account it will automatically hide the information password of the user.

Using the octal notations table instead of ‘r’, ‘w’ and ‘x’. Each digit octal notation can be used of either of the group ‘u’,’g’,’o’:

is a letter used to specify an option Wherein the list of supplementary can be specified, which the user should become a member of

consider as a database of a file it contains many information about the file

it refers to the physical file, the data stored in a particular location

In Linux, the __ file stores the user information, such as the user's name, UID, group id (GID), user's home directory, and user's shell. We can get the username by parsing.

Type ___ into the terminal, replacing “/path/to/file” with the file you want to give permissions to everyone for, and press “Enter.”

to allow executable permissions.

are core to the security model used by Linux systems. They determine who can access files and directories on a system and how.

The first field of the __ output is a group of metadata that includes the permissions on each file.

The R means you can “__” the file’s contents.

If any of the “rwx” characters is replaced by a __, then that permission has been revoked.

The first argument you give to the __command is ‘u’, ‘g’, ‘o’.

Now you would type a ‘+’ to say that you are “adding” a permission:

Then using __ sub user name user1 Is already created.

The command for changing directory permissions for group owners is similar, but add a “g” for group or “o” for users: foldername:

to give only read permission for everyone.

You can use multiple__statements to perform a multiway branch. However, this is not always the best solution, especially when all of the branches depend on the value of a single variable.

is a command-line interpreter and typical operations performed by shell scripts include file manipulation, program execution, and printing text

A __ is the string of directories and sub-directories you would have to navigate through in order to reach a given location in the le system Linux Suse Enterprise Server.

To have__ means to be logged in using the root account. This can be done from the main login screen, a shell prompt, or any application that requires your root password. Root access means that the user has permission to do anything on the system, so use root access with care.

It also called a file format, is the layout of a file -- in terms of how the data within the file is organized.

gz. a file compressed with gzip

a tarred and bzipped le

The conventional __ permission concept uses three classes of users for assigning Permissions in the file system: the owning user, the owning group and other users.

The ACL contains two entries, one for the name user __ and one __entry.

is a computer program designed to be run by the Unix/Linux shell.

The following script uses the __ command which takes the input from the keyboard and assigns it as the value of the variable PERSON and finally prints it on STDOUT.

It provides you with an interface to the Unix system. It gathers input from you and executes programs based on that input

The prompt __, which is called the command prompt

If you are using a __, the $ character is the default prompt.

Move forward one word ( delimited by a white space )

Jumps to the previous paragraph

Jump to the end of the next section

to Insert text at the end of the line.

to insert the file, below the cursor

Delete to the end of sentence

Replace the character under the cursor with

to paste from register x before current line

to Redo the last undo.

Switch case

Creating a Syntax for zip file

Bourne shell is usually installed as __ on most versions of Unix.

The basic concept of a shell script is a list of commands, which are listed in the order of execution. A good shell script will have comments, preceded by __ sign, describing the steps.

The __ statement in the Unix shell is very similar to the switch...case statement we have in other programming languages like C or C++ and PERL, etc

can contain only letters (a to z or A to Z), numbers ( 0 to 9) or the underscore character ( _).

Variables are defined as follows -

is used to locate /search file in linux or Unix

Display full details on matches

Display path to binaries

text editor was the brainchild of Bram Moolenar, a Dutch software engineer.

The following script will access the value of defined variable

NAME and print it on STDOUT –

#!/bin/sh

NAME="James "

echo $NAME

The exit status of the last command executed is

The following script generates an error while trying to change the value of

NAME – #!/bin/sh

NAME="Emma"

readonly NAME

NAME="Hello world!!"

is a variable that is present within the current instance of the shell. It is not available to programs that are started by the shell. They are set at the command prompt.

is available to any child process of the shell. Some programs need environment variables in order to function correctly.

All the arguments are individually double quoted. If a script receives two arguments, $@ is equivalent to $1 $2

There are special parameters that allow accessing all the command-line arguments at once. __ both will act the same unless they are enclosed in double quotes, "".

Last line mode

Insert mode

Move cursor one character to the left

Move cursor up one line

This option is used when we want to append the output, retaining the prior content of the file.

This option is used when we want to run a particular command rather than interactive shell and get terminal information in the file given as argument or typescript by default

if you want to search a particular information the postal code from a text file.

shows the matching line and its number.

matches both (upper and lower) case.

This command helps in sorting out the content of a file alphabetically.The syntax is

This symbol send the output of one command as input of another command

These are small accounts created inside the linux operating system linux accounts are useful especially if you are going to create a workstation

This symbol send the output of one command as input of another command

Same as :ql! Without writing changes

The filename of the current script

These variables correspond to the arguments with which a script was invoked

The Pipe is a command in Linux that lets you use two or more commands.

Locate searching tool is used to search for file index that actual file name.

The three user class are the owner,group and others

To add permissions for a group (group is either the group name or ID): # setfacl -m "g:group:permissions"

The path of the Bash shell in the directory structure is /bin/sh.

sort -r is used to sort a data in reverse order.

If you cannot remember the Ubuntu username, you can display a list of all users for the system. To do this, restart the machine, press "Shift" at the GRUB loader screen, select "Rescue Mode" and press "Enter." At the root prompt, type "cut –d: -f1 /etc/passwd" and then press "Enter." Ubuntu displays a list of all usernames assigned to the system. After finding the correct username, you can use the "passwd" command to assign a new password for the user.

Access control list (ACL) provides an additional, more flexible permission mechanism for file systems.

-i of grep will accept both (upper and lower) case.

Basically, ACLs are used to make a flexible permission mechanism in Linux

setfacl is used to set the ACLs of a file or directory

grep will scan the document for the desired information and present the result in a format you want. 114. To add permission for user setfacl -m "u:user:permissions" /path/to/file.

Bash or Bourne Again Shell is not the identical similar shell to Bourne or .sh in Unix.

-v of grep displays only the count of matching lines.

Sort can use powerful commands which can perforcomplex tasks in a jiffy.

Korn Shell or KSH was developed by a person named Davi Korn, which attempts to integrate the features of other shells like C shell, Bourne Shell, etc.

The default ACL is a specific type of permission assigned to a file.

Default ACLs can only be applied to files.

If you want to remove the set ACL permissions, use setfacl command with -r option.

Assigned a 777 permission for his file name "Linux.txt" to restrict the group account in editing the file.