Powerlevel10k: why do I need ! (exclamation mark) after >> ?

[t29mato]

Hi, I'm a newbie.
I've got a question.

echo 'source ~/powerlevel10k/powerlevel10k.zsh-theme' >>! ~/.zshrc
why do I need ! (exclamation mark) after >> ?

[romkatv]

If you have no_clobber option set and the target file doesn't exist, >> will fail while >>! will succeed. In all other cases there is no difference.

P.S.

This isn't the right place to ask basic questions about zsh syntax. "What's the difference between >>! and >>" is a question suited for /r/zsh, stackoverflow or zsh-users mailing list.

[t29mato]

@romkatv
I understood what you mean.

Actually, this is first time to create ticket in OSS projects for me.
From next time I will more consider which place is right to create issue.

Thank you so much!!