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At some point I used a shell command that continuously sent a very short string of text to the standard output, but at this moment I can't recall it's name.

Its name was something very short, like 'abc', useful to quickly create a file filled with text. I remember I was surprised I had never seen it, so I guess it might not be a Linux built-in command. It actually might be a zsh shell command, but at the moment I do not have access to a zsh shell. I tried to find it in bash with "compgen -c" but either is not there or I can't recall the name

I know I can script it, but I am curious whether someone knows about it

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There's the command yes(1)

yes - output a string repeatedly until killed

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