How to check if a file and executable exists with Java, in Unix?
I am trying to check if a file exists on Unix from a Java process.
I'm struggling with Runtime.getRuntime().exec()
The command I am trying to run, test -x $VAR/path/to/file
notice the Unix variable inside the path.
The command returns 0 or 1, but I don't know how to get an indication of this from within Java.
I am currently doing the following:
String cmd = "test -x $VAR/filename";
Process proc = Runtime.getRuntime().exec(cmd);
int exitCode = proc.waitFor();
I can also add ;echo $?
to the command that will print the value 0/1, but I don't know how to get the command output.
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You can use Java.io.File class It has methods canExecute()
andexists()
Example:
//Create new File
File file = new File("C:/test/testFile.exe");
//Check if file exists
if(file.exists()==true){
System.out.println("The File Exists");
//Check if file is executable
if(file.canExecute()==true){
System.out.println("The File is executable");
}
}
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I think what you are looking for is File#exists()
also File#canExecute()
to check for its existence and check if it is executable
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