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I'm currently writing a bash script. This bash script is installs some kind of applications. I have a manager menu for this applications. One of this application is a Music Bot. This Music Bot has some kind of permission system. If you want to add an admin you must edit a file. So I did a system for remembering old admins. It just prints admins to the file called admins. The numbers you saw is admin numbers. If you want to add multiple admins, then you have to seperate numbers with ",".

terdon

Q: How can I check if string exists in file

I'm currently writing a bash script. This bash script should check if the exact string 329, exists in myfile. I have searched through the web and found some answers, but I can't use -x parameters because I have more numbers than 329, on myfile. And without the -x parameter, I can get the Exists r...

@user1614432 ok

user1614432

I was able to manage adding admins but now is the problem removing. For removing you must specify the "," so I can just remove it by sed. Otherwise it just brokes

Thats why I need it

I was gonna do if the grep output is "Exists" then remove it with "," else remove it normally

terdon

So you have a number in a variable, and you want to check if that exact number exists as a field in your file.

user1614432

1:00 PM

Yes

terdon

Then why would you ever want to grep for 329? Is it because it could be the last number of the line so it would not have a , after it?

Like this:

2, 57, 329

user1614432

Its just an example, every users admin is different in the app. Mine is 329 and I added it last. Thats why it doesn't have "," character. But for some people it might have "," character.

terdon

yes, exactly so what you want is i) match if you find 329 followed by , OR ii) match if 329 is the last thing on the line. Correct?

Does this do what you want:

 grep -Ew '329(,|$)' myfile

user1614432

Let me check

terdon

(I had a typo which I corrected, make sure you copy this version)

 grep -Ew '329(,|$)' myfile

user1614432

1:04 PM

Yes, It works

Thank you so much dude!

I was gonna be crazy while searching it lol

terdon

Yay! I updated my answer to cover that.

You're welcome :)

user1614432

I accepted it as answer. Like I said thank you so much!

terdon

no problem, glad I could help

By the way @user1614432, you might find this post useful:

1237

A: How can I replace a string in a file(s)?

1. Replacing all occurrences of one string with another in all files in the current directory: These are for cases where you know that the directory contains only regular files and that you want to process all non-hidden files. If that is not the case, use the approaches in 2. All sed solutions ...

1 hour later…

Journeyman Geek

2:14 PM

@user1614432 I feel like a little bit of the config file for reference might make it easier

I tend to follow "this is what I have (config file), this is what I get (current way I am trying and the outout) and 'this is what I need' for questions like this

Erikli

3:07 PM

@terdon Hello, Do you have some ideas how can I delete a specific string from a text file?

I was using this but it seems unstable..
sed -r "s#${Cevap34}(,|$)##g" <.adminsold >.admins

terdon

Please post a new question and make sure to include i) an example input file with lines that should be changed and some lines that should not be changed and ii) the output you expect. I need to run now so I can't help here.

I suspect you don't want the g though

Erikli

When I post, can I send a link here for you?

@terdon I've posted. You can check;
https://askubuntu.com/questions/1422279/how-can-i-delete-specific-string-from-a-file

1 hour later…

Erikli

4:48 PM

Hello @terdon, How can I check if a text file has ",,"? I tried your way but it didn't work. It just detects one ","

I found the answer but now I have another problem :D. I must delete one "," from ",,". Can't find it

Found an alternative for that. Forget about it

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