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POPerforming multiple executions on Runtime exec
 

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    <p>I'm trying to do this simple unix ls in Android:</p> <pre><code>cd /data </code></pre> <p>then</p> <pre><code>ls </code></pre> <p>It should return all the content of /data folder.</p> <p>I've this coded:</p> <pre><code>try { String line; Process p = Runtime.getRuntime().exec(new String[] { "ls /data"}); BufferedReader in = new BufferedReader( new InputStreamReader(p.getInputStream()) ); while ((line = in.readLine()) != null) { Log.d("debugging", line); } in.close(); } catch (Exception e) { e.printStackTrace(); } </code></pre> <p>The problem I'm facing at the moment, is that I can't do more than a single command at once. For example, if I write <code>ls /data</code> its returning nothing. It seems that he doesn't like spaces.</p> <p>Everything works if I just write a single word like "ls" which is returning the list of root directory:</p> <pre><code>03-19 22:51:59.241: D/debugging(16274): acct 03-19 22:51:59.241: D/debugging(16274): cache 03-19 22:51:59.241: D/debugging(16274): config 03-19 22:51:59.241: D/debugging(16274): crashtag 03-19 22:51:59.241: D/debugging(16274): d 03-19 22:51:59.241: D/debugging(16274): data 03-19 22:51:59.241: D/debugging(16274): default.prop 03-19 22:51:59.241: D/debugging(16274): dev 03-19 22:51:59.241: D/debugging(16274): etc 03-19 22:51:59.241: D/debugging(16274): fstab 03-19 22:51:59.241: D/debugging(16274): init 03-19 22:51:59.241: D/debugging(16274): init.clrdex.sh 03-19 22:51:59.241: D/debugging(16274): init.goldfish.rc 03-19 22:51:59.241: D/debugging(16274): init.hostapd.sh 03-19 22:51:59.241: D/debugging(16274): init.rc 03-19 22:51:59.241: D/debugging(16274): init.semc.rc 03-19 22:51:59.241: D/debugging(16274): init.usbmode.sh 03-19 22:51:59.241: D/debugging(16274): logo.rle 03-19 22:51:59.241: D/debugging(16274): mnt 03-19 22:51:59.241: D/debugging(16274): mr.log 03-19 22:51:59.241: D/debugging(16274): proc 03-19 22:51:59.241: D/debugging(16274): root 03-19 22:51:59.241: D/debugging(16274): sbin 03-19 22:51:59.241: D/debugging(16274): sdcard 03-19 22:51:59.241: D/debugging(16274): sys 03-19 22:51:59.241: D/debugging(16274): system 03-19 22:51:59.241: D/debugging(16274): ueventd.goldfish.rc 03-19 22:51:59.241: D/debugging(16274): ueventd.rc 03-19 22:51:59.241: D/debugging(16274): ueventd.semc.rc 03-19 22:51:59.241: D/debugging(16274): vendor </code></pre> <p>I've tried as someone mentioned, to fill that array with multiple commands, but its returning nothing. Blank.</p> <pre><code>{"ls","ls"} //this should return twice ls result. </code></pre> <p><strong>Any ideas how can I "concatenate" a command in Android Runtime?</strong></p>
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    1. CODo you really need System.exec? Have you considered using `listFiles()` method from File (http://docs.oracle.com/javase/6/docs/api/java/io/File.html)
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    2. COI would use a [ProcessBuilder](http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/ProcessBuilder.html) instead of `Runtime.getRuntime.exec()`.
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    3. COI do, because it's not what I'm trying to do at the end. I want to call a system program, but if I can't handle doing two different commands at "once" I won't be able to run those programs
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