Linux 输出重定向符号 `>!` 是啥意思?

搬运http://zsh.sourceforge.net/Doc/Release/Redirection.html

>| word
>! word
Same as >, except that the file is truncated to zero length if it exists, even if CLOBBER is unset.

@paulw54jrn Is it zsh only?

http://en.wikipedia.org/wiki/Clobbering

$ echo "Hello, world" >file.txt
$ echo "This will overwrite the first greeting." >file.txt
$ set -o noclobber
$ echo "Can we overwrite it again?" >file.txt
-bash: file.txt: cannot overwrite existing file
$ echo "But we can use the >| operator to ignore the noclobber." >|file.txt
$ # Successfully overwrote the contents of file.txt using the >| operator
$ set +o noclobber # Changes setting back

@paulw54jrn
@pfitseng

懂了! thanks