this post was submitted on 23 Feb 2025

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correct way to echo | sudo tee (lemmy.world)

submitted 2 years ago* (last edited 2 years ago) by Agility0971@lemmy.world to c/linux@lemmy.ml

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Can someone explain why this would make the command wait forever? What is tee waiting for?

echo "test" | sudo tee newfile

What would be a scriptable workaround for such cases?

Edit: this command would not terminate in zsh. This works fine in bash tho.

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[–] bleistift2@sopuli.xyz 8 points 2 years ago (6 children)

Can’t reproduce.

16:22:48:~/tmp$ echo foo | sudo tee newfile
[sudo] Passwort für bleistift2:         
foo

16:23:02:~/tmp$ ls -l newfile
-rw-r--r-- 1 root root 4 Feb 23 16:22 newfile

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[–] Agility0971@lemmy.world [S] 3 points 2 years ago (5 children)

I just switched over to bash and it worked lol. It just didn't return for me in zsh...

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[–] 2xsaiko@discuss.tchncs.de 6 points 2 years ago

I use zsh and it works fine for me fwiw. Same with zsh --no-rcs (which doesn't load zshrc). Maybe you have some weird setting enabled?

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[–] bleistift2@sopuli.xyz 3 points 2 years ago (1 child)

My initial guess was that sudo would eat up the echo’d foo as the password. Maybe sudo works differently when invoked via zsh?

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[–] Agility0971@lemmy.world [S] 1 point 2 years ago

sudo does not prompt for password in my container. It just elevates the privileges straight away. Yeah, it's hard to tell. Or test for that matter.

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[–] MyNameIsRichard@lemmy.ml 1 point 2 years ago* (1 child)

It works here in zsh, did you mistype the closing quote? Although that alters my prompt.

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[–] Agility0971@lemmy.world [S] 1 point 2 years ago*

no way. I'm in /tmp for this one

echo 'test' | tee newfile
tee: newfile: Permission denied
test
echo 'test' | sudo tee newfile #the prompt never returns when running this in zsh

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