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POHow to execute shell builtin from Scala
 

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    <p>I need to check some system settings like <code>ulimit -n</code> from Scala script in Linux. Had I to deal with ordinary commands I would use <code>scala.sys.process</code> package like:</p> <pre><code>import scala.sys.process._ println("ls -lha".!!) </code></pre> <p>Unfortunately this doesn't work for shell builtins. Is there any way to catch an output from shell builtin in Scala?</p> <p><strong>Update:</strong></p> <p>I tried the usual trick <code>sh -c "ulimit -n"</code> in several forms with no luck; All the commands below fail:</p> <pre><code>"sh -c 'ulimit -n'".!! "sh -c \"ulimit -n\"".!! """sh -c "ulimit -n"""".!! """sh -c "ulimit -n """ + "\"".!! </code></pre> <p>And I'm getting a runtime error in REPL:</p> <pre><code>-n": 1: Syntax error: Unterminated quoted string java.lang.RuntimeException: Nonzero exit value: 2 at scala.sys.package$.error(package.scala:27) at scala.sys.process.ProcessBuilderImpl$AbstractBuilder.slurp(ProcessBuilderImpl.scala:131) at scala.sys.process.ProcessBuilderImpl$AbstractBuilder.$bang$bang(ProcessBuilderImpl.scala:101) at .&lt;init&gt;(&lt;console&gt;:11) at .&lt;clinit&gt;(&lt;console&gt;) at .&lt;init&gt;(&lt;console&gt;:11) at .&lt;clinit&gt;(&lt;console&gt;) at $print(&lt;console&gt;) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.call(IMain.scala:704) at scala.tools.nsc.interpreter.IMain$Request$$anonfun$14.apply(IMain.scala:920) at scala.tools.nsc.interpreter.Line$$anonfun$1.apply$mcV$sp(Line.scala:43) at scala.tools.nsc.io.package$$anon$2.run(package.scala:25) at java.lang.Thread.run(Thread.java:722) </code></pre>
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    1. CODid you try it outside of the REPL, e.g., in a Scala script?
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