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PO(Java) Changed directory (via bash script) not reflected in folder.listfiles
 

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  1. PO(Java) Changed directory (via bash script) not reflected in folder.listfiles
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    <p>I run a bash script from my Java program which takes a chunk of data, manipulates it, and splits it up.</p> <p>It's not a question of whether the bash script works -- I can see the split files in the directory.</p> <p>Say the original file was "bigFile" in data/</p> <p>Then</p> <pre><code> try { Process proc = Runtime.getRuntime().exec("bash " + SCRIPT_DIR + "/" + SPLIT_SCRIPT_NAME + " " + args[_MESSAGES_PER_UPLOAD_] + " " + args[_MAXIMUM_MESSAGES_PER_FEED_] + " " + (60000*Integer.parseInt(args[_DURATION_BEFORE_EACH_UPLOAD_IN_MINUTES_])/Integer.parseInt(args[_DURATION_OF_EACH_FEED_IN_MILLISECONDS_]))); proc.waitFor(); } catch(IOException e) { error(e); } String fileNames; File folder = new File(DATA_DIR); File[] filesToUpload = folder.listFiles(); for (int i = 0; i &lt; filesToUpload.length; ++i) if (filesToUpload[i].isFile()) { fileNames = filesToUpload[i].getName(); System.out.println(fileNames); } </code></pre> <p>Will print bigFile, not...</p> <p>$ ls data/</p> <p>dataChunk_00000 dataChunk_00001 dataChunk_00002 dataChunk_00003 dataChunk_00004 dataChunk_00005 dataChunk_00006 dataChunk_00007 dataChunk_00008 dataChunk_00009 dataChunk_00010 dataChunk_00011 dataChunk_00012 dataChunk_00013 dataChunk_00014 dataChunk_00015 dataChunk_00016 dataChunk_00017 dataChunk_00018 dataChunk_00019 dataChunk_00020 dataChunk_00021 dataChunk_00022 dataChunk_00023 dataChunk_00024 dataChunk_00025 dataChunk_00026 dataChunk_00027</p> <p>as it should. I'm guessing this is a compiler optimization or something.</p> <p>Edit: If somebody could explain to me why proc.waitFor() isn't working and/or a better way to solve this, I'd much appreciate it.</p>
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    1. USRyan
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    1. COCould you share the content of your bash script? Or at least explain what it is doing step-by-step?
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      1. USJesse Webb
    2. COAs an aside, you should use `Runtime.exec(String[])` instead of `.exec(String)` like you're doing here, for all but the absolute *simplest* things. `Runtime.exec()` is not a shell or parser and doesn't honor quoting or escaping. Providing all your arguments in a single string can often lead to unexpected treatment of arguments because `exec(String)` blindly splits on spaces.
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      1. USStephen P
 

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