my task is to collect node details and list them in certail format. I need to write data to a file and save it as csv file and attach it as artifacts.
But i am not able to create a file using groovy scripts in the jenkins using plugin "Execute System Groovy" as build step

```
import jenkins.model.Jenkins
import hudson.model.User
import hudson.security.Permission
import hudson.EnvVars

EnvVars envVars = build.getEnvironment(listener);

filename = envVars.get('WORKSPACE') + "\\node_details.txt";
//filename = "${manager.build.workspace.remote}" + "\\node_details.txt"
targetFile = new File(filename);
println "attempting to create file: $targetFile"

if (targetFile.createNewFile()) {
    println "Successfully created file $targetFile"
} else {
    println "Failed to create file $targetFile"
}
print "Deleting ${targetFile.getAbsolutePath()} : "
println targetFile.delete()

```

Output obtained

```
attempting to create file: /home/jenkins/server-name/workspace/GET_NODE_DETAILS\node_details.txt
FATAL: No such file or directory
java.io.IOException: No such file or directory
    at java.io.UnixFileSystem.createFileExclusively(Native Method)
    at java.io.File.createNewFile(File.java:947)
    at java_io_File$createNewFile.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:42)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:112)
    at Script1.run(Script1.groovy:13)
    at groovy.lang.GroovyShell.evaluate(GroovyShell.java:682)
    at groovy.lang.GroovyShell.evaluate(GroovyShell.java:666)
    at hudson.plugins.groovy.SystemGroovy.perform(SystemGroovy.java:81)
    at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
    at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:772)
    at hudson.model.Build$BuildExecution.build(Build.java:199)
    at hudson.model.Build$BuildExecution.doRun(Build.java:160)
    at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:535)
    at hudson.model.Run.execute(Run.java:1732)
    at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
    at hudson.model.ResourceController.execute(ResourceController.java:88)
    at hudson.model.Executor.run(Executor.java:234)

```

Some time i see people use "manager" object, how can i get access to it ?
Alos any ideas on how to accomplish the task ?