Linux - String operators

so let us check our string operators now

as we have already discussed which we

can use as strings for licking out or

checking out our operators and variables

same here we can use different kind of

operators using the string called as

equals to so equals to will be used for

click again checking on two of different

operators we have area below one and

variable B but we do not have any

expressions added into it

so directly we can add your a and B and

we can check whether this particular

variables which we have added are equal

or not same way we can use not equals to

sign which we can also use into your

operators other operators as well where

we can compare both the values and we

can define they're not equal to or not

next we have - said - said we'll check

whether the value of this variable is 0

or not if it is 0 the value will get

true and if it is false if it is not 0

the value will get false the next we

have - and - and is for checking whether

the value of a is 0 or nonzero so

generally -

enmons nonzero so - n of a is nonzero

that means the variable a is not 0 it

can be above number of tries ero it can

be 1 it can be 2 but not the 0 then we

have STR STR means empty string we do

not have anything into the variable a

just variable we have created and we can

letter add the strings by using the

input commands or we can add it later

wires so this are the different type of

string operators which generally we have

so let us check on our terminal how we

can use this operators into our program

so here in condition I have checked for

my same file with a particular value I'm

going to add and I want to enter a file

name so it will read a file name it will

check whether the file it is a file or

it is directory that is a file it will

show me this is a file if it is

directory it will show me the set

directory so this is a just I'm going to

check the file if I use -

we'll check for the directory if I use -

I have faith we'll check for the files

so right now I want to check for the

files if it is a file it will show me in

the file if the name is in the directory

it will show me it is a directory so let

us check how it works now here I'm going

to add a file now touch sample file 1

this is the file and same way I'm going

to add a directory with demo dir 1 okay

and I'm going to run as such and then

the file name I'm going to add and then

first I need to run this script that is

I have taught as such I like the file

name now I'm going to hide you finally

man sample file 1 so I just showing me

it is file if I run the commands or if I

run the script again and if I define

demo dir 1 so it is showing me it as a

directory so automatically it will

detect whether the input I have provided

whether the name of the father have

provided whether it is a file or it is a

directory so this way we can also check

whether we are using a file or a

directory same we can also check whether

we have set any your user IDs or you can

say group IDs

or security group IDs for the file or

folder or not so for that I can just

change it in such a way I can just make

it - G so I can provide the entries and

I can change the echo file and I can

show it as such else not set actually

this is not set right

so we can just I have created e-file as

we know we haven't set any particular

permission to our file or directory so I

just I will run the same AF dot SH and

the file name and define default name I

had that was a sample

file1 so it is not set right so it will

always check for the SIDS gid whether we

have defined a security group ID for it

or not so this we have seen how we can

define and how we can use the same

operators that is your file string

operators even if I want to check for

the directories I can

so that I can check for better than

filename is a directory or it is a file

so just define D and here we'll set up

the value is a file or it really tree to

show me it's a directory or it should

show me it is a file so let's check

really command as such I F not as such

I'm going to define the name demo dir

one could train me to directory

well one showing mateesah file so this

is how generally we can use our file

string or Praetorians as well

so using this particular object routes

are you know it will be very helpful for

you and when you start you say creating

the loops or you when you start creating

your own programs so you can use any of

these operators over there and it will

perform it won't get conflicted with

your other operators if you have already

used into the same loop so you can use

any mixture of any operators so here I

have completed with the operators into

the next video we are also going to see

many more things what we can add into

the shells and defining conditions to

this shell so for that keep watching