Saturday, November 20, 2010
Sunday, November 14, 2010
Downsampling MP3 file
#!/usr/bin/tclsh
set ffmpeg [exec which ffmpeg]
puts "ffmpeg = $ffmpeg"
if { [llength $argv] < 2 } {
puts "\n$argv0 n bps\n"
exit -1
}
set fi [lindex $argv 0]
set br [lindex $argv 1]
puts "$fi"
puts "target $br bps"
if { [regexp -all {(.*)\.([mM][pP]3)} $fi a b c] } {
set fo "${b}_${br}bps.$c"
puts "$fi ==> $fo, ext=$c, new bitrate=$br"
set id3 [exec id3v2 -l $fi]
set id3par ""
if { [regexp -line {TIT2.*: (.*)\n} $id3 dummy title c] } { puts Title=$title }
if { [regexp -line {TPE1.*: (.*)\n} $id3 dummy singer c] } { puts singer=$singer }
if { [regexp -line {TALB.*: (.*)\n} $id3 dummy album c] } { puts album=$album }
if { [regexp -line {TYER.*: (.*)\n} $id3 dummy year c] } { puts year=$year }
if { [regexp -line {TCON.*\(([0-9]+)\)\n} $id3 dummy genre c] } { puts genre=$genre }
set cmd "$ffmpeg -threads 16 -y -ab $br -i $fi $fo"
if {![file exists $fo]} {
if { [catch { set res [eval exec $cmd] fid }] } {
#puts stderr "Could not execute $cmd"
if {[info exists fid] } { puts stderr $fid" }
#exit 1
}
}
if {[info exists title]} { append idpar " --TIT2 \"$title\"" }
if {[info exists singer]} { append idpar " --TPE1 \"$singer\"" }
if {[info exists album]} { append idpar " --TALB \"$album\"" }
if {[info exists year]} { append idpar " --TYER \"$year\"" }
if {[info exists genre]} { append idpar " --TCON \"$genre\"" }
set cmd "id3v2 $idpar $fo"
puts $cmd
if { [file exists $fo]} {
eval exec $cmd
}
} else {
puts "Not an MP3 file"
}
Login restriction/Limitation based on time schedue
This is how to limit a user (in this case, his name is "Joko") to access computer during weekdays and weekends at certain time duration.
This will not allow joko to login during weekdays before 3 pm or after 8:30 pm or weekends outside 9 am - 9 pm. To disallow certain service, replace '*' in the first entry with a PAM service name (e.g, login, etc.). Files in /etc/pam.d reflect the service names.
On my computer, the following files are the service names can be used:
A good solution to limit use of computer from kids during school days!
- Edit file
/etc/pam.d/common-account
and add a line "account required pam_time.so" - Edit file
/etc/security/time.conf
and add the following lines to the end of file.
#services ttys users times # # allow Joko to use computer during weekdays 3 pm-8:30pm OR weekends 9:00am - 9:00pm * ; * ; joko; Wk1500-2030 | Wk0900-2100
This will not allow joko to login during weekdays before 3 pm or after 8:30 pm or weekends outside 9 am - 9 pm. To disallow certain service, replace '*' in the first entry with a PAM service name (e.g, login, etc.). Files in /etc/pam.d reflect the service names.
On my computer, the following files are the service names can be used:
-rw-r--r-- 1 root root 217 2010-07-05 04:57 atd -rw-r--r-- 1 root root 167 2010-07-05 06:44 chage -rw-r--r-- 1 root root 218 2010-07-05 06:44 chfn -rw-r--r-- 1 root root 218 2010-07-05 06:44 chsh lrwxrwxrwx 1 root root 17 2010-09-13 10:39 common-account -> common-account-pc -rw-r--r-- 1 root root 378 2010-07-05 05:15 common-account.pam-config-backup -rw-r--r-- 1 root root 446 2010-11-14 09:01 common-account-pc lrwxrwxrwx 1 root root 14 2010-09-13 10:39 common-auth -> common-auth-pc -rw-r--r-- 1 root root 448 2010-07-05 05:15 common-auth.pam-config-backup -rw-r--r-- 1 root root 557 2010-11-14 09:01 common-auth-pc lrwxrwxrwx 1 root root 18 2010-09-13 10:39 common-password -> common-password-pc -rw-r--r-- 1 root root 855 2010-07-05 05:15 common-password.pam-config-backup -rw-r--r-- 1 root root 506 2010-11-14 09:01 common-password-pc lrwxrwxrwx 1 root root 17 2010-09-13 10:39 common-session -> common-session-pc -rw-r--r-- 1 root root 435 2010-07-05 05:15 common-session.pam-config-backup -rw-r--r-- 1 root root 573 2010-11-14 09:01 common-session-pc -rw-r--r-- 1 root root 287 2010-07-05 04:56 crond -rw-r--r-- 1 root root 56 2010-09-15 13:49 cups -rw-r--r-- 1 root root 204 2010-07-05 16:24 gdm -rw-r--r-- 1 root root 206 2010-07-05 16:24 gdm-autologin -rw-r--r-- 1 root root 239 2010-07-05 08:06 gnomesu-pam -rw-r--r-- 1 root root 216 2010-07-28 09:45 init -rw-r--r-- 1 root root 419 2010-07-05 22:36 login -rw-r--r-- 1 root root 251 2010-07-05 05:15 other -rw-r--r-- 1 root root 133 2010-07-05 06:44 passwd -rw-r--r-- 1 root root 165 2010-07-05 06:18 polkit -rw-r--r-- 1 root root 165 2010-07-05 07:10 polkit-1 -rw-r--r-- 1 root root 173 2010-07-05 14:34 ppp -rw-r--r-- 1 root root 481 2010-07-05 05:32 remote -rw-r--r-- 1 root root 165 2010-09-15 14:14 samba -rw-r--r-- 1 root root 209 2010-07-05 06:44 shadow -rw-r--r-- 1 root root 165 2010-09-14 07:07 smtp -rw-r--r-- 1 root root 268 2010-07-05 14:41 sshd -rw-r--r-- 1 root root 239 2010-07-05 05:00 su -rw-r--r-- 1 root root 203 2010-09-07 06:01 sudo -rw-r--r-- 1 root root 239 2010-07-05 05:00 su-l -rw-r--r-- 1 root root 172 2010-07-05 06:44 useradd -rw-r--r-- 1 root root 569 2010-07-05 05:58 vsftpd -rw-r--r-- 1 root root 241 2010-07-29 04:36 wxconsole -rw-r--r-- 1 root root 204 2008-09-03 08:45 xdm -rw-r--r-- 1 root root 166 2008-09-03 08:45 xdm-np -rw-r--r-- 1 root root 265 2010-08-23 16:44 xen-api
A good solution to limit use of computer from kids during school days!
Monday, November 8, 2010
My First Objective-C
List.h:
List.m:
#import <objc/Object.h>
@interface List : Object // List is a subclass of the superclass Object
{
int list[100]; // These are instance variables.
int size;
}
/* Public methods */
- free;
- (int) addEntry: (int) num;
- print;
/* Private methods */
/* Other programs should not use these methods. */
- resetSize;
@end
List.m:
#import "List.h"
@implementation List
+ new // factory method
{
self = [super new];
[self resetSize];
return self;
}
- free
{
return [super free];
}
- (int) addEntry: (int) num
{
list[size++] = num;
return size;
}
- print
{
int i;
printf("\n");
for (i = 0; i < size; ++i)
printf ("%i ", list[i]);
puts("");
return self; // Always return self
// if n
othing else makes sense.
}
- resetSize
{
size = 0;
return self;
}
Stack.h:
#import <objc/Object.h>
typedef struct StackLink {
struct StackLink *next;
//void *data;
int data;
} StackLink;
@interface Stack : Object
{
StackLink *top;
unsigned int size;
}
- free;
- push: (int) anInt;
- addEntry: (int) anInt;
- (int) pop;
- (unsigned int) size;
@end
Stack.m:
#import "Stack.h"
#import <stdlib.h>
@implementation Stack
#define NULL_LINK (StackLink *) 0
+ new
{
self = [super new];
top = NULL_LINK; //(StackLink *) 0;
return self;
}
- free
{
StackLink *next;
while (top != NULL_LINK)
{
next = top->next;
free ((char *) top);
top = next;
}
return [super free];
}
- push: (int) value
{
StackLink *newLink;
newLink = (StackLink *) malloc (sizeof (StackLink));
if (newLink == 0)
{
fprintf(stderr, "Out of memory\n");
return nil;
}
newLink->data = value;
newLink->next = top;
top = newLink;
size++;
return self;
}
- addEntry: (int) value
{
return [self push: value];
}
- (int) pop
{
int value;
StackLink *topLink;
if (0 != size)
{
topLink = top;
top = top->next;
value = topLink->data;
free (topLink);
size--;
}
else
{
value = 0;
}
return value;
}
- (unsigned int) size
{
return size;
}
- print
{
StackLink *startLink;
int i = size;
startLink = top;
while (startLink) {
printf("Stack[%d] = %d\n", i, startLink->data);
startLink = startLink->next;
i--;
}
return self;
}
@end
main.m:
#import <objc/Object.h>
#import "List.h"
#import "Stack.h"
//int main(int argc, char *argv[])
void perform (id obj)
{
[obj addEntry: 5];
[obj print];
[obj addEntry: 6];
[obj addEntry: 3];
[obj print];
}
main()
{
id list;
list = [List new];
perform(list);
[list free];
id stack;
stack = [Stack new];
perform(stack);
[stack free];
printf("\n");
return 0;
}
Makefile:
.SUFFIXES: .o .m
.m.o:
$(CC) -c $(CFLAGS) $< -o $@
# Macros
CC=gcc
#CFLAGS=-Wall -Wno-import -mtune=core2 -mfpmath=sse -ffast-math -msse3 -fobjc-exceptions
CFLAGS=-Wno-import -mtune=core2 -g
LDFLAGS=-lobjc
SRCS=main.m List.m Stack.m
OBJS=$(SRCS:.m=.o)
EXECUTABLE=main
.PHONY: all
all: $(EXECUTABLE)
$(EXECUTABLE): $(OBJS)
$(CC) $(LDFLAGS) -o $@ $(OBJS)
#$(OBJS): $(SRCS)
# echo "$(CC) -c $(CFLAGS) $< -o $@"
clean:
rm -f *.o $(EXECUTABLE)
TAGS: $(SRCS)
ctags -R $(SRCS)
Tuesday, November 2, 2010
MiniDuckSimulator.java
import java.io.Console;
/**
* @author mlutfi
*
*/
public class MiniDuckSimulator {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Duck mallard = new MallardDuck();
mallard.display();
mallard.performQuack();
mallard.performFly();
Duck model = new ModelDuck();
model.display();
model.performFly();
model.setFlyBehavior(new FlyRocketPowered());
model.performFly();
}
}
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