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1
57
58 import java.io.*;
59 import java.util.*;
60
61 import org.apache.oro.text.*;
62 import org.apache.oro.text.regex.*;
63
64
71 public final class groups {
72
73 public static final void main(String  [] args) {
74 int user;
75 MatchActionProcessor processor = new MatchActionProcessor();
76 final Hashtable groups = new Hashtable();
77 Vector users = new Vector();
78 Enumeration usersElements;
79 MatchAction action = new MatchAction() {
80 public void processMatch(MatchActionInfo info) {
81 ((Vector)groups.get(info.match.toString())).addElement(
83 info.fields.elementAt(0));
84 }
85 };
86
87 if(args.length == 0) {
88 args = new String [1];
90 args[0] = System.getProperty("user.name");
91 }
92
93 try {
94 processor.setFieldSeparator(":");
95 for(user = 0; user < args.length; user++) {
96 if(!groups.containsKey(args[user])) {
98 groups.put(args[user], new Vector());
99 processor.addAction(args[user], action);
101 users.addElement(args[user]);
103 }
104 }
105 } catch(MalformedPatternException e) {
106 e.printStackTrace();
107 System.exit(1);
108 }
109
110 try {
111 processor.processMatches(new FileInputStream("/etc/group"),
112 System.out);
113 } catch(IOException e) {
114 e.printStackTrace();
115 System.exit(1);
116 }
117
118 usersElements = users.elements();
119
120 while(usersElements.hasMoreElements()) {
121 String username;
122 Enumeration values;
123
124 username = (String )usersElements.nextElement();
125 values = ((Vector)groups.get(username)).elements();
126
127 System.out.print(username + " :");
128 while(values.hasMoreElements()) {
129 System.out.print(" " + values.nextElement());
130 }
131 System.out.println();
132 }
133
134 System.out.flush();
135 }
136
137 }
138
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Java API By Example, From Geeks To Geeks.