/home/users/wolff/EECS382/JAVA> javac -g cat.java

/home/users/wolff/EECS382/JAVA> jdb cat -U cat.java
Initializing jdb ...
> stop in cat.main
Deferring breakpoint cat.main.
It will be set after the class is loaded.
> run
run cat -U cat.java
Set uncaught java.lang.Throwable
Set deferred uncaught java.lang.Throwable
> 
VM Started: Set deferred breakpoint cat.main

Breakpoint hit: "thread=main", cat.main(), line=7 bci=0
7        int i, argc=argv.length;

main[1] step
> 
Step completed: "thread=main", cat.main(), line=8 bci=3
8        boolean uflag=false, fflag=false;

main[1] step
> 
Step completed: "thread=main", cat.main(), line=9 bci=8
9        String fn = null;

main[1] step
> 
Step completed: "thread=main", cat.main(), line=10 bci=11
10        DataInputStream fin = null;

main[1] step

Step completed: "thread=main", cat.main(), line=12 bci=14
12        for(i=0; i<argc; i++) {

main[1] main[1] print argc
 argc = 2
main[1] print argv[0] 
 argv[0] = "-U"
main[1] print argv[1]
 argv[1] = "cat.java"
main[1] step
> 
Step completed: "thread=main", cat.main(), line=13 bci=21
13          if (argv[i].equals("-U")) { uflag=true; }

main[1] step
> 
Step completed: "thread=main", cat.main(), line=12 bci=104
12        for(i=0; i<argc; i++) {

main[1] step
> 
Step completed: "thread=main", cat.main(), line=13 bci=21
13          if (argv[i].equals("-U")) { uflag=true; }

main[1] step
> 
Step completed: "thread=main", cat.main(), line=14 bci=37
14          else if (argv[i].charAt(0) != '-') { fflag=true; fn=new String(argv[i]); }

main[1] print i
 i = 1
main[1] print uflag
 uflag = true
main[1] print fflag
 fflag = false
main[1] step
> 
Step completed: "thread=main", cat.main(), line=12 bci=104
12        for(i=0; i<argc; i++) {

main[1] print fflag
 fflag = true
main[1] print i
 i = 1
main[1] step

Step completed: "thread=main", cat.main(), line=20 bci=110
20        if (fflag) {

main[1] main[1] print i
 i = 2
main[1] print fflag
 fflag = true
main[1] step
> 
Step completed: "thread=main", cat.main(), line=22 bci=115
22            fin = new DataInputStream(new FileInputStream(fn));

main[1] step
> 
Step completed: "thread=main", cat.main(), line=27 bci=133
27        } }

main[1] step
> 
Step completed: "thread=main", cat.main(), line=30 bci=184
30          c=(fflag)?fin.read():System.in.read();

main[1] print c
com.sun.tools.example.debug.expr.ParseException: Name unknown: c
 c = null
main[1] list
26            System.err.close( ); System.exit(1);
27        } }
28        int c;
29        for(;;) {
30 =>       c=(fflag)?fin.read():System.in.read();
31          if (c<0) { break; }
32          if (uflag) { c=Character.toUpperCase((char)c); }
33          System.out.write(c);
34        }
35        if (fflag) { fin.close(); }
main[1] step
> 
Step completed: "thread=main", cat.main(), line=31 bci=205
31          if (c<0) { break; }

main[1] print c
 c = 105
main[1] step
> 
Step completed: "thread=main", cat.main(), line=32 bci=213
32          if (uflag) { c=Character.toUpperCase((char)c); }

main[1]