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POIn linux, how can I test whether the output of a program is going to a live terminal or to a file?
 

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  1. POIn linux, how can I test whether the output of a program is going to a live terminal or to a file?
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    <p>When you use <a href="http://en.wikipedia.org/wiki/Git_(software)" rel="noreferrer">git</a> it seems to magically know whether standard out is going through a pipe or into a file vs when it is being displayed to the console. For example, if you have colors enabled and you do </p> <pre><code>git status </code></pre> <p>it will colorize the output for different categories of files being listed. However, if you do</p> <pre><code>git status | less </code></pre> <p>or </p> <pre><code>git status &gt; status.txt </code></pre> <p>it removes the <a href="http://www.ibm.com/developerworks/linux/library/l-tip-prompt/" rel="noreferrer">linux color formatting</a> and you only see plain, uncolored text.</p> <p>How does <code>git</code> detect whether the output of its commands are going to file vs going to the terminal?</p>
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    1. COI don't think that this should be on superuser, as the OP is really looking for is how does the program ie. git detects where it is being redirected or not.
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    2. COI agree with @tommieb75 it is an API question, not a how do I admin question.
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    3. COBy the way, if you weren't just curious, and you were asking this because you wanted to have colorized *and* paged output from git, you can mess with `git config` settings like `core.pager` (less) and `color.pager` (true). http://www.kernel.org/pub/software/scm/git/docs/git-config.html
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