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    <p>First you do not need to use <code>cat</code> to count lines. This is an <a href="http://en.wikipedia.org/wiki/Cat_(Unix)#Useless_use_of_cat" rel="noreferrer">antipattern called Useless Use of Cat</a> (UUoC). To count lines in files in the current directory, use <a href="https://en.wikipedia.org/wiki/Wc_(Unix)" rel="noreferrer"><code>wc</code></a>:</p> <pre><code>wc -l * </code></pre> <p>Then the <code>find</code> command recurses the sub-directories:</p> <pre><code>find . -name "*.c" -exec wc -l {} \; </code></pre> <ul> <li><p><code>.</code> is the name of the top directory to start searching from</p></li> <li><p><code>-name "*.c"</code> is the pattern of the file you're interested in </p></li> <li><p><code>-exec</code> gives a command to be executed</p></li> <li><p><code>{}</code> is the result of the find command to be passed to the command (here <code>wc-l</code>)</p></li> <li><p><code>\;</code> indicates the end of the command </p></li> </ul> <p>This command produces a list of all files found with their line count, if you want to have the sum for <strong>all</strong> the files found, you can use find to list the files (with the <code>-print</code> option) and than use xargs to pass this list as argument to wc-l.</p> <pre><code>find . -name "*.c" -print | xargs wc -l </code></pre> <p>EDIT to address Robert Gamble comment (thanks): if you have spaces or newlines (!) in file names, then you have to use <code>-print0</code> option instead of <code>-print</code> and <code>xargs -null</code> so that the list of file names are exchanged with null-terminated strings. </p> <pre><code>find . -name "*.c" -print0 | xargs -0 wc -l </code></pre> <p>The Unix philosophy is to have tools that do one thing only, and do it well.</p>
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    1. POHow to count lines of code including sub-directories
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    1. USDan Dascalescu
    1. USphilant
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    1. POHow to count lines of code including sub-directories
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    1. COSeconded. Wanted to point out the UUoC (Useless Use of Cat), but didn't.
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      1. USayaz
    2. COI think that the particular challenge is to get the *total* line count for an entire tree of files. Is there a way to do that simply using the find command?
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      1. USchromakode
    3. COYour xargs example is almost identical to what I originally came up with by it doesn't handle filenames with spaces in them.
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      1. USRobert Gamble
 

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