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POExecuting an external executable in a working directory containing spaces in Java?
 

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  1. POExecuting an external executable in a working directory containing spaces in Java?
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    <p>I have a specific need to unrar files found in different subdirectories during execution of my program on Os x. I do this by calling the freeware command line tool unrar, which works very well. However, unrar will always unrar files in the current working directory, which means that I have to specify a working directory for the executed process or get every unpacked file in my .jar home folder. This is easy enough to do using either the processBuilder.directory(dir) or <code>runTime.getRuntime().exec(args,null,dir)</code> for example where dir is a File. This works excellent but not when the working directory contains a space. As a short example:</p> <pre><code>File dir=new File("/Users/chargedPeptide/rar 2"); String[] cmd = { "/Users/chargedPeptide/rar/unrar", "e", "-o+","/Users/chargedPeptide/rar", "2/weather.rar"}; Process pr = Runtime.getRuntime().exec(cmd,null,dir); int exitValue=pr.waitFor(); </code></pre> <p>Will not work, while using: <code>Process pr = Runtime.getRuntime().exec(cmd);</code> instead will launch the command successfully but leave me with all of the files in the jars working directory. Using processbuilder instead and using p<code>rocessbuilder.directory(dir);</code> to set the directory exits with the message:</p> <pre><code>Exception: Cannot run program "/Users/chargedPeptide/rar/unrar" (in directory "/Users/chargedPeptide/rar 2"): error=2, No such file or directory </code></pre> <p>Help? How do I handle the spaces? I've tried adding backslashes before the spaces to make them literal no help since the File object treats them like actual part of the path.</p> <p>Edit: To make the whole thing a bit more clear: 1. I have a separate method that feeds the execute method a command and a directory to processbuilder, all directories are found by the previous method and exist. This works except when the dir contains a space. 2.I need to set the working dir or the command will execute in the wrong place. 3.Parsing the file object by: dir=new File(dir.tostring.replace(" ","\ "); to put a backslash in front of all spaces does not work since the java File object then looks for a path containing actual backslashes. No luck. 4.Using rt.exec instead of processbuilder dosen't help either.</p> <p>Any ideas most welcome.</p>
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    1. COif unrar has some extension (like .sh), can you try with putting them in the cmd array?
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    2. COalso see http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html?page=4 if it helps
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    3. COThank you for the link, while not helping me with this particular problem, rhe redirecting output to a file example helped me with a separate one. unrar seems to have no extension.
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