This should be very simple but I am not sure why its not working. I am trying pass arguments with a name (So I can pass arguments in any order) using the apache commons CLI library but It seems to be not working. I want to pass the arguments from eclipse IDE. I know this part is not the problem because I am able to print the arguments with args[0] kind.
import org.apache.commons.cli.CommandLine; import org.apache.commons.cli.CommandLineParser; import org.apache.commons.cli.DefaultParser; import org.apache.commons.cli.Options; import org.apache.commons.cli.ParseException; public class MainClass { public static void main(String[] args) throws ParseException { System.out.println(args[0]); Options options = new Options(); options.addOption("d", false, "add two numbers"); CommandLineParser parser = new DefaultParser(); CommandLine cmd = parser.parse( options, args); if(cmd.hasOption("d")) { System.out.println("found d"); } else { System.out.println("Not found"); } }
The above lines are exactly like the examples given online but i dont know why its not working. I am struggling this from a day now. Please help where I am going wrong.
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Answer
According to the examples name of the parameter should be present in command line
Property without value
Usage: ls [OPTION]... [FILE]... -a, --all do not hide entries starting with .
And the respective code is:
// create the command line parser CommandLineParser parser = new DefaultParser(); // create the Options Options options = new Options(); options.addOption( "a", "all", false, "do not hide entries starting with ." );
In this scenario correct call is:
ls -a
or ls --all
With value separated by space
-logfile <file> use given file for log
Respective code is:
Option logfile = OptionBuilder.withArgName( "file" ) .hasArg() .withDescription( "use given file for log" ) .create( "logfile" );
And call would be:
app -logfile name.of.file.txt
With value separated by equals
-D<property>=<value> use value for given property
The code is:
Option property = OptionBuilder.withArgName( "property=value" ) .hasArgs(2) .withValueSeparator() .withDescription( "use value for given property" ) .create( "D" );
And call would be:
app -Dmyprop=myvalue