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How to check if gpg key already exist with bash then skip downloading/adding?

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1

So basically, I want to run these 2 commands but I want to check if the keys already existed. I know how to do the ifthenelse in bash but I'm not sure how to get the result and store in variable for me to check so that i can put it in the conditional operator. For example, if it already existed then I can skip downloading and adding it again.

Example 1 (--fetch-keys):

 sudo apt-key adv --fetch-keys https://packages.microsoft.com/keys/microsoft.asc
sudo tee /etc/apt/sources.list.d/vscode.list > /dev/null <<- END
 deb [arch=amd64] https://packages.microsoft.com/repos/vscode stable main
END

Example 2 (--recv-keys):

 sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys B9A06DE3
sudo tee /etc/apt/sources.list.d/inkscape.list > /dev/null <<- END
 deb [arch=amd64] http://ppa.launchpad.net/inkscape.dev/stable-daily/ubuntu bionic main
END

bash gnupg keys

share|improve this question

asked Sep 25 at 7:35

sudorangersudoranger

3355 bronze badges

add a comment
 | 

1

So basically, I want to run these 2 commands but I want to check if the keys already existed. I know how to do the ifthenelse in bash but I'm not sure how to get the result and store in variable for me to check so that i can put it in the conditional operator. For example, if it already existed then I can skip downloading and adding it again.

Example 1 (--fetch-keys):

 sudo apt-key adv --fetch-keys https://packages.microsoft.com/keys/microsoft.asc
sudo tee /etc/apt/sources.list.d/vscode.list > /dev/null <<- END
 deb [arch=amd64] https://packages.microsoft.com/repos/vscode stable main
END

Example 2 (--recv-keys):

 sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys B9A06DE3
sudo tee /etc/apt/sources.list.d/inkscape.list > /dev/null <<- END
 deb [arch=amd64] http://ppa.launchpad.net/inkscape.dev/stable-daily/ubuntu bionic main
END

bash gnupg keys

share|improve this question

asked Sep 25 at 7:35

sudorangersudoranger

3355 bronze badges

add a comment
 | 

So basically, I want to run these 2 commands but I want to check if the keys already existed. I know how to do the ifthenelse in bash but I'm not sure how to get the result and store in variable for me to check so that i can put it in the conditional operator. For example, if it already existed then I can skip downloading and adding it again.

Example 1 (--fetch-keys):

 sudo apt-key adv --fetch-keys https://packages.microsoft.com/keys/microsoft.asc
sudo tee /etc/apt/sources.list.d/vscode.list > /dev/null <<- END
 deb [arch=amd64] https://packages.microsoft.com/repos/vscode stable main
END

Example 2 (--recv-keys):

 sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys B9A06DE3
sudo tee /etc/apt/sources.list.d/inkscape.list > /dev/null <<- END
 deb [arch=amd64] http://ppa.launchpad.net/inkscape.dev/stable-daily/ubuntu bionic main
END

bash gnupg keys

share|improve this question

asked Sep 25 at 7:35

sudorangersudoranger

3355 bronze badges

 sudo apt-key adv --fetch-keys https://packages.microsoft.com/keys/microsoft.asc
sudo tee /etc/apt/sources.list.d/vscode.list > /dev/null <<- END
 deb [arch=amd64] https://packages.microsoft.com/repos/vscode stable main
END

 sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys B9A06DE3
sudo tee /etc/apt/sources.list.d/inkscape.list > /dev/null <<- END
 deb [arch=amd64] http://ppa.launchpad.net/inkscape.dev/stable-daily/ubuntu bionic main
END

share|improve this question

asked Sep 25 at 7:35

sudorangersudoranger

3355 bronze badges

share|improve this question

asked Sep 25 at 7:35

sudorangersudoranger

3355 bronze badges

asked Sep 25 at 7:35

sudorangersudoranger

3355 bronze badges

asked Sep 25 at 7:35

sudorangersudoranger

3355 bronze badges

1 Answer
1

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1

How about something like:

TEST=$(apt-key list 2> /dev/null | grep my_app_name)
if [[ ! $TEST ]]; then
 echo "Missing - need to run --fetch-keys or --recv-keys"
fi

I piped stderr into the null device ( 2> /dev/null ) to hide the warning you get for using apt-key list in a script.

Try running "sudo apt-key list" on its own so you can see what the output looks like, in case you want to change the "grep" to be more selective.

share|improve this answer

edited Sep 27 at 10:37

answered Sep 25 at 9:27

Eric MintzEric Mintz

1,44355 silver badges1818 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hi there, gpg list gives me different output than the keys i have added using apt-key can you confirm? Are they using the same “keyring” mechanism?
  
  – sudoranger
  Sep 26 at 1:47
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Thanks for the question. I should have used apt-key list in my example. I've just modified it.
  
  – Eric Mintz
  Sep 26 at 10:25
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I've accepted your answer. It should work now. I can use the subshell to check if one of my keys are matching the one that already existed on the machine, thus skipping them. Thank you so much!
  
  – sudoranger
  Sep 27 at 6:43
  
  

  
  
  
  

add a comment
 | 

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1

How about something like:

TEST=$(apt-key list 2> /dev/null | grep my_app_name)
if [[ ! $TEST ]]; then
 echo "Missing - need to run --fetch-keys or --recv-keys"
fi

I piped stderr into the null device ( 2> /dev/null ) to hide the warning you get for using apt-key list in a script.

Try running "sudo apt-key list" on its own so you can see what the output looks like, in case you want to change the "grep" to be more selective.

share|improve this answer

edited Sep 27 at 10:37

answered Sep 25 at 9:27

Eric MintzEric Mintz

1,44355 silver badges1818 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hi there, gpg list gives me different output than the keys i have added using apt-key can you confirm? Are they using the same “keyring” mechanism?
  
  – sudoranger
  Sep 26 at 1:47
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Thanks for the question. I should have used apt-key list in my example. I've just modified it.
  
  – Eric Mintz
  Sep 26 at 10:25
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I've accepted your answer. It should work now. I can use the subshell to check if one of my keys are matching the one that already existed on the machine, thus skipping them. Thank you so much!
  
  – sudoranger
  Sep 27 at 6:43
  
  

  
  
  
  

add a comment
 | 

1

How about something like:

TEST=$(apt-key list 2> /dev/null | grep my_app_name)
if [[ ! $TEST ]]; then
 echo "Missing - need to run --fetch-keys or --recv-keys"
fi

I piped stderr into the null device ( 2> /dev/null ) to hide the warning you get for using apt-key list in a script.

Try running "sudo apt-key list" on its own so you can see what the output looks like, in case you want to change the "grep" to be more selective.

share|improve this answer

edited Sep 27 at 10:37

answered Sep 25 at 9:27

Eric MintzEric Mintz

1,44355 silver badges1818 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Hi there, gpg list gives me different output than the keys i have added using apt-key can you confirm? Are they using the same “keyring” mechanism?
  
  – sudoranger
  Sep 26 at 1:47
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Thanks for the question. I should have used apt-key list in my example. I've just modified it.
  
  – Eric Mintz
  Sep 26 at 10:25
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I've accepted your answer. It should work now. I can use the subshell to check if one of my keys are matching the one that already existed on the machine, thus skipping them. Thank you so much!
  
  – sudoranger
  Sep 27 at 6:43
  
  

  
  
  
  

add a comment
 | 

How about something like:

TEST=$(apt-key list 2> /dev/null | grep my_app_name)
if [[ ! $TEST ]]; then
 echo "Missing - need to run --fetch-keys or --recv-keys"
fi

I piped stderr into the null device ( 2> /dev/null ) to hide the warning you get for using apt-key list in a script.

Try running "sudo apt-key list" on its own so you can see what the output looks like, in case you want to change the "grep" to be more selective.

share|improve this answer

edited Sep 27 at 10:37

answered Sep 25 at 9:27

Eric MintzEric Mintz

1,44355 silver badges1818 bronze badges

TEST=$(apt-key list 2> /dev/null | grep my_app_name)
if [[ ! $TEST ]]; then
 echo "Missing - need to run --fetch-keys or --recv-keys"
fi

share|improve this answer

edited Sep 27 at 10:37

answered Sep 25 at 9:27

Eric MintzEric Mintz

1,44355 silver badges1818 bronze badges

answered Sep 25 at 9:27

Eric MintzEric Mintz

1,44355 silver badges1818 bronze badges

answered Sep 25 at 9:27

Eric MintzEric Mintz

1,44355 silver badges1818 bronze badges