?? ls.java
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// this program is to simulate the behavior of the ls command on linux/unix operate system.
import java.io.File;
import java.util.Date;
public class Ls {
public static void printOne(File f) {
if (f.exists()) {
System.out.print(f.canRead() ? "r" : "-");
System.out.print(f.canWrite() ? "w" : "-");
System.out.print(f.isDirectory() ? "d" : "-");
System.out.print('\t');
System.out.print(f.length());
System.out.print('\t');
System.out.print(new Date(f.lastModified()));
System.out.print('\t');
} else {
System.out.print("\t\t\t\t\t");
}
System.out.println(f.getName());
}
public static void main(String[] args) {
if (args.length != 1) {
System.err.println("Usage: java Ls <filepath>");
System.exit(-1);
}
File f1 = new File(args[0]);
String[] ls;
int i;
for (ls = f1.list(), i = 0;
ls != null && i < ls.length;
printOne(new File(f1, ls[i])), i++);
}
}
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