Linux - Shell operators

so till now we have seen the different

types of variables which we can use into

the linux shell scripting now here we

are going to talk about the basic

operators which we can use into the

Linux operating system

what the operators are operators can be

any symbol we'll be using here like plus

subtraction addition division

multiplication subtraction equal to not

equal to all this but here we have

different categories of it which we

should know before we start with the

operators actually we have this five

categories very first we have that is

called as arithmetic operators now as

discussed we can use a nation sign

subtraction sign multiplication sign

this all operators are called as your

arithmetic operators for programming if

I want to add two different numbers I

can go for adding me for using the

automatical operators by giving the

first variable plus or the addition sign

with the second variable that is a plus

B so those operators where are you I am

using plus my subtraction division

multiplication signs are called as a

mathematical operators next we have that

is relational operators now if I am

relating two different variables now for

example is value equals to one these

value equals to two I want to check

whether they are equal or not so that is

nothing but the relation now I'm

checking out the relation between both

the variables if there are equipments

they are equal if they are not

equivalent they do not have a relation

or they are not equal right so those

kind of variables we can use into the

relational operators next we have called

as a boolean operators now Boyan

operators are generally used where we

need to define all or and operators like

if a equals to B B equals to C whether

it is there or not so it can be all an

and condition like for example I can

take a person can be a gender of a

person can be either male or a female so

it can be all condition where the input

which we can define for a variable can

be a male or a female right it cannot be

a both so that's reason they are using

our operators so value can be

are equal to or not equal to a

particular value so that kind of

operators are used into the boolean

operators the second operator is called

as and when I'm defining any particular

letter or if I'm defining my name I can

add my name into the caps lock on that

means in capital letters or into a small

letters so both are my name itself so

anything can be acceptable correct so

this value can be added either in small

case or into upper case so I can add

both the conditions I can use both the

conditions so that I will be using and

conditions so basically all the or and

and conditions which we use are into the

boolean operators next we have that is a

string of traitors not if suppose I am

adding some condition if I'm adding

strings now for example the letters

which we have into the a variable called

as like ABC into B we have three two one

so this two are the different variables

I have added they have different format

altogether as well

one is having strain other is having

number I can check for body variables I

can compare both the variables if those

variables contain a true value so it

will show me the string as true if it

contains a false value it will show me

in a string called as false

so whenever if I want to create a

condition where I am going to define

true and false values by comparing my

different variables that I'll be using

the string operators the next operators

we have that is file test operators now

this operators generally works to test

for a file content now if suppose I want

to check my file which I have created is

of 100 MB or mode or not so I can check

by using this particular operator

so this operators will always work on

file I can check what the file contents

are what are the letters we have written

on the file what is the size of the file

what is the format of the file all the

tests will be performed on a specific

file itself so we just need to define

the file name which we want to test here

so this 35 basic operators we generally

have so into the next video I am going

to explore all the operators one

one and then we'll see some of the codes

or some of the script created by using

this operators