當我初次接觸shell script時,看別人寫的script或者範例時, 2>&1這類型的符號真困擾我.
找到了一篇文章,和各位分享 原文 http://bowen.blog.51cto.com/136148/94406
0 代表鍵盤輸入
1 代表螢幕輸出
2 代表錯誤輸出
$ cat nop.txt > output.txt
cat: nop.txt: No such file or directory
Even if we redirect the stdout to a file, we still see the error output in the screen, because we are redirecting just the standard output, not the standard error.
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