output redirection in UNIX

Posted by Happy Mittal on Stack Overflow See other posts from Stack Overflow or by Happy Mittal
Published on 2010-04-15T08:47:52Z Indexed on 2010/04/15 8:53 UTC
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redirection

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unix

I am a beginner in UNIX. I am finding some difficulty in input/output redirection.

ls -l >temp

cat temp

Here why temp file is shown in the list and moreover, it is showing 0 characters.
wc temp >temp

cat temp

here output is 0 0 0 temp. Why lines, words, characters are 0.

Please help me to undestand this concept.

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