I have a file within there is this sentence: "title dos". how could i know with if condition that this sentence exist in the file and it exactly as it should be. I dont have a problem if the line will end with whitespaces or tabs(this may happen if someone didn't write it right("title dos ").what i mean is how could i know the line is right and doesnt end with a letter that someone wrote in mistake
(for example:"title dos h"). I will be so glad if someone could help and send the exact answer.i know how to find the sentence(egrep 'title dos([[:space:]]*)?$' filename) but i dont know how to put it in an if condition(as part of a script)

Hello and welcome to LinuxQuestions,

Assign the command to a variable and then test the variable with your if statement:
I'll leave the if statement to you since this sounds a bit like homework to me

Kind regards,

Eric

the problem is that i tried it with a variable but still dont know to what should i compare it

Hi,

The variable will hold the result of the command you put between `` so you should compare to that's what you test against. If it's true then do something, if it's not true then do nothing.

Have a look at Bash Beginners Guide more in particular Chapter 7.

Kind regards,

Eric

Or if you want to be a little tricky you can use the '-q' switch and then just test the return of success or failure