Monday, November 27, 2006
My New Homepage.
Check my new homepage at http://vaibhav.gupta.googlepages.com/
You can download all the scripts from the given page.
My stumble page http://vaibhav.stumbleupon.com/
Vaibhav.
Friday, November 24, 2006
[perl] Create dir and links for a given dir.
#!/usr/bin/perl
#written by vaibhav gupta
#Creates a new directory for a given directory and creates links for files.
$dir = $ARGV[0];
&usages unless $dir ;
©
sub usages {
print "Usages: <Dirname> \n";
exit;
}
sub copy {
@result = `find $dir -type d`;
$dirname = `echo "$dir" | rev | cut -d"/" -f 1 | rev`;
chomp $dirname;
$desination = "$dirname";
foreach $d(@result) {
chomp $d;
($a,$b) = split(/$dirname/,$d);
print "Creating $desination$b\n";
# print "[$a -- $b]";
@res = `mkdir -p $desination$b`;
print @res;
}
@result = `find $dir -type f `;
foreach $d(@result) {
chomp $d;
($a,$b) = split(/$dirname/,$d);
print "Copying $d\n";
@res = `ln -s $d $desination$b`;
print @res;
}
}
#written by vaibhav gupta
#Creates a new directory for a given directory and creates links for files.
$dir = $ARGV[0];
&usages unless $dir ;
©
sub usages {
print "Usages: <Dirname> \n";
exit;
}
sub copy {
@result = `find $dir -type d`;
$dirname = `echo "$dir" | rev | cut -d"/" -f 1 | rev`;
chomp $dirname;
$desination = "$dirname";
foreach $d(@result) {
chomp $d;
($a,$b) = split(/$dirname/,$d);
print "Creating $desination$b\n";
# print "[$a -- $b]";
@res = `mkdir -p $desination$b`;
print @res;
}
@result = `find $dir -type f `;
foreach $d(@result) {
chomp $d;
($a,$b) = split(/$dirname/,$d);
print "Copying $d\n";
@res = `ln -s $d $desination$b`;
print @res;
}
}
[perl] Popup window
#!/usr/bin/perl
# written by vaibhav gupta
use Gtk2 '-init';
$x=100;$y=100; #default Cordinates
$blue = 0xffff ;
$label = "Hello there";
$label = $ARGV[0] if $ARGV[0];
$delay = 5 ;
$delay = $ARGV[1] if $ARGV[1];
$x = $ARGV[2] if $ARGV[2];
$y = $ARGV[3] if $ARGV[3];
$blue = $ARGV[4] if $ARGV[4] ;
sub usages {
print "\n $ARGV[0] <label> <delay> <x> <y> <color>\n";
}
$window = Gtk2::Window->new("popup");
$window->set_title("Hello");
$window->signal_connect( destroy => sub {Gtk2->main_quit}) ;
$label = Gtk2::Label->new($label);
$label->modify_fg('normal',Gtk2::Gdk::Color->new(0,0,$blue) );
$window->add($label);
$window->move($x,$y);
#$window->resize(300,30);
$window->show_all();
Glib::Idle->add( sub { Gtk2->main_quit; 0 } );
#$window->begin_move_drag(0,100,100,1);
Gtk2->main;
print `sleep $delay`;
# written by vaibhav gupta
use Gtk2 '-init';
$x=100;$y=100; #default Cordinates
$blue = 0xffff ;
$label = "Hello there";
$label = $ARGV[0] if $ARGV[0];
$delay = 5 ;
$delay = $ARGV[1] if $ARGV[1];
$x = $ARGV[2] if $ARGV[2];
$y = $ARGV[3] if $ARGV[3];
$blue = $ARGV[4] if $ARGV[4] ;
sub usages {
print "\n $ARGV[0] <label> <delay> <x> <y> <color>\n";
}
$window = Gtk2::Window->new("popup");
$window->set_title("Hello");
$window->signal_connect( destroy => sub {Gtk2->main_quit}) ;
$label = Gtk2::Label->new($label);
$label->modify_fg('normal',Gtk2::Gdk::Color->new(0,0,$blue) );
$window->add($label);
$window->move($x,$y);
#$window->resize(300,30);
$window->show_all();
Glib::Idle->add( sub { Gtk2->main_quit; 0 } );
#$window->begin_move_drag(0,100,100,1);
Gtk2->main;
print `sleep $delay`;
[python] Start Python
#!/usr/bin/python
import sys
import os
import __builtin__
def helloworld():
print "Dare to Challenge http://www.pythonchallenge.com/"
print "Hello World\n";
print "This is system Path : "
print sys.path #this is search Path
sys.path.append("this/is/test/path");
print "This is system Path after appending test path "
print sys.path
filename = os.environ.get('PYTHONSTARTUP')
print filename
if filename and os.path.isfile(filename):
execfile(filename)
li = []
print "Method of list ", dir(li) # list all the method of list
info(__builtin__, 20) # gives the list of built in function
#Factorial Function Start
def fact(n):
if n > 1:
return n * fact(n-1)
else:
return 1
def info(object, spacing=10, collapse=1):
"""Print methods and doc strings.
Takes module, class, list, dictionary, or string."""
# note
methodList = [e for e in dir(object) if callable(getattr(object, e))]
processFunc = collapse and (lambda s: " ".join(s.split())) or (lambda s: s)
print "\n".join(["%s %s" %
(method.ljust(spacing),
processFunc(str(getattr(object, method).__doc__)))
for method in methodList])
def datatypes():
str = "This is a string."
print str
dict = {"server":"mpilgrim", "database":"this will be deleted"}
print "Currnt Dictionary: ", dict # NOte that it printed in a sorted way.
dict["server"] = "CHANGED"
dict["uid"] = "added"
dict["Uid"] = "case sensitive"
dict[2] = "mixed data"
dict["mixed"] = 123
del dict["database"]
print "Now Dictionary : " , dict
dict.clear() # To clear all the contents
list = ["a", "b", "mpilgrim", "removethis", "example","pop"]
print "Current List :" , list
print "Length of List : ", len(list)
print "list[-1] :", list[-1] #"li[-n] == li[len(li) - n]"
print "Slicing :", list[1:-1]
print "Pop Element: ", list.pop()
list.append("append")
list.extend(["extend1","extend2"]) #note the arg is a list. Concatenates
list.insert(2,"inserthere")
list.remove("removethis");
list += ["Operators"]
print "Now List : ",list
print "Searching extend1 (first occurence): Found at location ", list.index("extend1")
print "Found c in list:" , "c" in list
list = ["1","2"]
print "List Operator : ", list * 10
tuple = ("son","mon","tue","wed","thu","fri","sat") # Ordered, fast, But can not be modified
print tuple
(a,b,c,d,e,f,g) = range(7)
print "rnage d = ", d
#3.6
#Calling main Functions.
helloworld()
#print fact(500)
#datatypes();
#info(list)
""" Notes
---------- and-or Trick ----------
>>> a = "first"
>>> b = "second"
>>> 1 and a or b
'first'
>>> 0 and a or b
'second'
---------- and-or Trick Safely ----------
>>> a = ""
>>> b = "second"
>>> (1 and [a] or [b])[0]
---------- split With No Arguments ----------
>>> s = "this is\na\ttest"
>>> print s
this is
a test
>>> print s.split()
['this', 'is', 'a', 'test']
>>> print " ".join(s.split())
'this is a test'
"""
import sys
import os
import __builtin__
def helloworld():
print "Dare to Challenge http://www.pythonchallenge.com/"
print "Hello World\n";
print "This is system Path : "
print sys.path #this is search Path
sys.path.append("this/is/test/path");
print "This is system Path after appending test path "
print sys.path
filename = os.environ.get('PYTHONSTARTUP')
print filename
if filename and os.path.isfile(filename):
execfile(filename)
li = []
print "Method of list ", dir(li) # list all the method of list
info(__builtin__, 20) # gives the list of built in function
#Factorial Function Start
def fact(n):
if n > 1:
return n * fact(n-1)
else:
return 1
def info(object, spacing=10, collapse=1):
"""Print methods and doc strings.
Takes module, class, list, dictionary, or string."""
# note
methodList = [e for e in dir(object) if callable(getattr(object, e))]
processFunc = collapse and (lambda s: " ".join(s.split())) or (lambda s: s)
print "\n".join(["%s %s" %
(method.ljust(spacing),
processFunc(str(getattr(object, method).__doc__)))
for method in methodList])
def datatypes():
str = "This is a string."
print str
dict = {"server":"mpilgrim", "database":"this will be deleted"}
print "Currnt Dictionary: ", dict # NOte that it printed in a sorted way.
dict["server"] = "CHANGED"
dict["uid"] = "added"
dict["Uid"] = "case sensitive"
dict[2] = "mixed data"
dict["mixed"] = 123
del dict["database"]
print "Now Dictionary : " , dict
dict.clear() # To clear all the contents
list = ["a", "b", "mpilgrim", "removethis", "example","pop"]
print "Current List :" , list
print "Length of List : ", len(list)
print "list[-1] :", list[-1] #"li[-n] == li[len(li) - n]"
print "Slicing :", list[1:-1]
print "Pop Element: ", list.pop()
list.append("append")
list.extend(["extend1","extend2"]) #note the arg is a list. Concatenates
list.insert(2,"inserthere")
list.remove("removethis");
list += ["Operators"]
print "Now List : ",list
print "Searching extend1 (first occurence): Found at location ", list.index("extend1")
print "Found c in list:" , "c" in list
list = ["1","2"]
print "List Operator : ", list * 10
tuple = ("son","mon","tue","wed","thu","fri","sat") # Ordered, fast, But can not be modified
print tuple
(a,b,c,d,e,f,g) = range(7)
print "rnage d = ", d
#3.6
#Calling main Functions.
helloworld()
#print fact(500)
#datatypes();
#info(list)
""" Notes
---------- and-or Trick ----------
>>> a = "first"
>>> b = "second"
>>> 1 and a or b
'first'
>>> 0 and a or b
'second'
---------- and-or Trick Safely ----------
>>> a = ""
>>> b = "second"
>>> (1 and [a] or [b])[0]
---------- split With No Arguments ----------
>>> s = "this is\na\ttest"
>>> print s
this is
a test
>>> print s.split()
['this', 'is', 'a', 'test']
>>> print " ".join(s.split())
'this is a test'
"""
The Fastest Language
Well,
Though this post is a little digression from what this forum is meant
for. It is really an interesting one because many a times we think
Which language is the fastest?
Considering the same hardware/environments are provided, it will all
depend on how well a compiler/interpreter make use of underlying
hardware/environment to generate native/interpreted code.
In a computer language shootout [Survey]
differrent compiler for different languages tested against their
ability to translate code for Ackermann Function
[Ackermann_function], Fibonacci numbers[Fibonacci_number] and
Tak functions [TAKFunction.html].
I was really happy to see that my favourite compiler gcc rules :-)
-by sbjoshi
Wednesday, September 27, 2006
[Perl] Script to take backups
#!/usr/bin/perl
# Written By Vaibhav Gupta
# vaibhav.gupta@gmail.com
# Modify @FILES_TO_BACKUP @DIRS_TO_BACKUP @FILES_PATH as per your need.
$Directory=`date +%Y%m%d%k%M`;
chomp $Directory; # you know why ?
$HOMEDIRECTORY="~guptav/";
@FILES_TO_BACKUP=(".vimrc",".bashrc","public_html/cgi-bin/index.cgi");
@DIRS_TO_BACKUP=( "cvsroot","public_html/","bin");
@FILES_PATH=("/etc/httpd/conf/httpd.conf");
print "\nCreating directory $Directory\n";
@message = `mkdir $Directory`;
foreach $filename (@FILES_TO_BACKUP) {
@message = `cp $HOMEDIRECTORY$filename $Directory`;
}
foreach $filename (@FILES_PATH) { #Absolute Filename
@message = `cp $filename $Directory`;
}
foreach $dirname (@DIRS_TO_BACKUP) {
@message = `cp -r $HOMEDIRECTORY$dirname $Directory`;
}
@message = `tar -cvzf $Directory.tgz $Directory`;
print @message;
#Vaibhav.
Monday, September 11, 2006
[shell] To find the PPID of a PID and more.
1 #!/bin/bash
2 pid=$1
3 if [ -f "/proc/$pid/stat" ]; then
4 name=`cat /proc/$pid/stat | cut -d" " -f 2`
5 else
6 echo "Not a Valid pid $pid"
7 exit
8 fi
9
10
11 while [ "$pid" -gt "0" ]; do
12 echo -n $pid
13 echo -n [$name]
14 echo -n " --> "
15 name=`cat /proc/$pid/stat | cut -d" " -f 2`
16 pid=`cat /proc/$pid/stat | cut -d" " -f 4`
17 done
18
19 echo "0"
20
-Vaibhav
Writing Kernel Modules for 2.6
hello.c
1 #include <linux/module.h>
2 #include <linux/kernel.h>
3
4 int init_module(void)
5 {
6 printk(KERN_INFO "Hello world \n");
7 return 0;
8 }
9
10 void cleanup_module(void)
11 {
12 printk(KERN_INFO "Goodbye world \n");
13 }
Makefile
1 obj-m += hello.o
2
3 all:
4 make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
5
6
7 clean:
8 make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
9 fresh: clean all
Commands:
Install Module# insmod hello.ko
Remove Module # rmmod hello.ko
Module info # modinfr hello.ko
List Module # lsmod
Check Log # tail /var/log/messages
Files :
/proc/modules | List of modules |
/proc/kallsyms | List of Symbols |
Vaibhav.
Sunday, July 02, 2006
[c++] Source code to find Prime numbers < n+1
/*Code is written by Vaibhav Gupta*/
int prime(int n){
bool *prime = new bool[n+1];
int i;
for(i=0;i<n+1;i++){
prime[i] = true;
}
prime[0]=false;
prime[1]=false;
int m = (int)sqrt((float)n);
for (i=2; i<=m; i++)
if (prime[i])
for (int k=i*i; k<=n; k+=i)
prime[k]=false;
for (i=0; i<n+1; i++){
if (prime[i]) cout << i << " ";
}
cout << endl;
return 0;
}
Tuesday, June 20, 2006
[ebooks] Over 1 billion ebooks.......
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http://www.teamphotoshop.com/photoshop/tut...ials/ps_tut.php
http://www.80four.co.uk/tutorials/photoshop.html
http://www.eyesondesign.net/pshop/tuts.htm
http://www.good-tutorials.com/
http://www.grafx-design.com/tutorials.html
http://myjanee.home.insightbb.com/tutorials.htm
http://www.photoshoproadmap.com/photoshop- ...rials-tips.html
http://rainworld.com/psworkshop/
http://131.128.51.37/se-lab-server.ddns.....edu.sg/ebooks/
http://www.et.utt.ro/public/Docs/
http://www.docs.rinet.ru
http://www.tutorialized.com
http://books.malonus.com/ebooks/computer_science/
http://www.intersoftlb.com/blog4.aspx (mcsd books)
http://131.128.51.37/se-lab-server.ddns.....edu.sg/ebooks/
(nice)(electronic...computer)
http://www.et.utt.ro/public/Docs/
http://www.docs.rinet.ru
http://www.tutorialized.com
http://books.malonus.com/ebooks/computer_science/ (nice)
http://cip.uni-trier.de/jia/links/weball.htm
http://www.gorkhali.com/kamal/download.htm
ftp://ftp.runnet.ru/BOOKS/
Happy reading.......
Bye
Tuesday, May 30, 2006
How to set up thinclient in Linux
Thin Client How to by Vaibhav Gupta
How to set up Thintux Server
You need to setup dhcp server and copy thintux folder on the server.
Setting up dhcp server
a. Make dhcpd configuration file :-> /etc/dhcpd.conf
b. Starting dhcpd :-> /etc/init.d/dhcpd start
Configuring dhcpd.conf Manually:-
1. Set subnet,netmask,router and range of IPs.
2. Set Thintux session server address, resolution and color depth.
3. Detailed Information man dhcpd, man dhcpd.conf
4. Get Sample Configuration dhcpd.conf (For Linux)<a
href="thintux/dhcpd.conf" >[dhcpd.conf] </a>
Format of dhcp.conf :-
[code]
#global parameters...
subnet 10.105.0.0 netmask 255.255.128.0 {
# subnet-specific parameters...
range 10.105.13.101 10.105.13.210;
option routers 10.105.1.250;
option THINTUX_SESSION_SERVER "10.105.11.23";
option THINTUX_SCREEN_RESOLUTION "800x600";
option THINTUX_SCREEN_COLOR_DEPTH "8";
}
group {
#group-specific parameters...
host abc.iitb.ac.in {
#host-specific parameters...
}
}
[/code]
Configuring using config-dhcpd :-
1. http://config-dhcpd.sourceforge.net/
Start X Display Manager
1. vim /usr/X11R6/lib/X11/xdm/xdm-config
2. Comment the last line as below :-
!DisplayManager.requestPort: 0
3. Save and Exit
4. vim /usr/X11R6/lib/X11/xdm/Xaccess
5. uncomment the following line (By removing #)
#* #any host can get a login window
6. Save and Exit
7. Start xdm :-> xdm
Help and Debug :-
1. man xdm
2. Error Logs :-> /var/log/xdm-errors
or :-> /usr/X11R6/lib/X11/xdm/xdm-errors
3. X -query 10.105.11.23
Check tftp is enable on server
1. vim /etc/xinetd.d/tftp
2. Change the disable option to "no" as Below.
disable = no
3. Save file and exit
4. Restart xinitd
Copy /thintux folder in /tftboot on server
<a href="thintux/thintux.tgz" >[thintux][tgz] </a>
http://thintux.sourceforge.net/
How to setup thinclient
Client already contaning Linux OS
1. Copy "localdsk" as /root/thinlinux on Client <a
href="thintux/localdsk" >[localdsk][x86 boot sector] </a>
2. Modify /etc/lilo.conf
3. Run lilo
4. Restart the PC
Add following Entries to lilo.conf:-
default=thin-linux # Add or Modify this line for default Booting from N/w
image=/root/thinlinux
label=thin-linux
read-only
Client that doesnot contain Linux OS
For all the following steps you have to use Dos Bootable Floopy
containg fdisk, format, syslinux.com and linux image(thintux) [as
downloaded above].
1. Delete all partitions on Hard Drive using fdisk.
2. Execute :-> fdisk /mbr
3. Create 20MB Dos Partion and Make active
4. Reboot
5. Execute:-> Format C:
6. Execute:-> syslinux c:
7. Execute:-> copy linux c: The above file "linux" is same as "localdsk". Only the name is
changed in this case.
8. Remove Floppy and Reboot
For Debugging
1. Use tcpdump as
tcpdump -n port 7100
tcpdump -n port tftp
Links
http://thintux.sourceforge.net
http://www.dhcp.org
http://www.dhcp-handbook.com/dhcp_faq.html
http://syslinux.zytor.com
http://www.vlug.org/vlug/meetings/X-terminal_presentation/overview.html
C++ Programs [Interview]
Find the number which is odd number of times? [Interview]
Dated: Wed Dec 28 22:44:42 IST 2005
14 int findodd(int *n,int len)
15 {
16 int num=0;
17 for(int i=0;i<len;i++)
18 num^=n[i];
19 return num;
20 }
How would u sort of 0s and 1s in just single pass? [Interview]
Dated: Wed Dec 28 22:27:42 IST 2005
1 void sort_01 (int *n,int len)
2 {
3 int i=0,j=len-1;
4 while(1){
5 while((!n[i])&&(i<len)) i++;
6 while((n[j])&&(j>-1)) j--;
7 if(i>=j) break;
8 n[i]=~n[i]&1;
9 n[j]=~n[j]&1;
10 i++;j--;
11 }
12 }
Find all possible splits for any given number n. [Interview]
Dated: Wed Dec 28 21:33:48 IST 2005
Init : int array[5]={0,0,0,0,0};
Function Call : split(array,5,0);
1 void split(int *n,int count,int len)
2 {
3 if(count==1) {
4 int i;
5 for(i=0;i<len;i++)
6 printf("%d+",n[i]);
7 printf("%d\n",n[i]+1);
8 return;
9 }
10 else {
11 n[len]+=1;
12 split(n,count-1,len);
13 split(n,count-1,len+1);
14 n[len]-=1;
15 }
16 return ;
17 }
WAP to check a integer (as binary string) is pallindrome? [Interview]
Dated: Wed Dec 28 18:27:43 IST 2005
1 bool panlindrome(unsigned long i)
2 {
3 if(!(i&1)) return false;
4 unsigned long t=i,rev=1;
5 t>>=1;
6 while(t) {
7 rev<<=1;
8 if(t&1) rev |=1;
9 t >>=1;
10 }
11 if(rev==i) return true;
12 return false;
13 }
Find the number of ones in an integer? [Interview]
Dated: Wed Dec 28 18:17:14 IST 2005
1 unsigned noofone(unsigned long i)
2 {
3 int count=0;
4 while(i) i=i&(~(i&(~i+1))),count++;
5 return count;
6 }
WAP to convert a given integer to octal number? [Interview]
Dated: Wed Dec 28 17:45:04 IST 2005
1 #include<stdio.h>
2 void int2octal (unsigned long i)
3 {
4 if(i) {
5 unsigned long o = i&7;
6 i>>=3;
7 int2octal(i);
8 printf("%d",o);
9 }
10 else printf("0");
11 }
How to reverse a singly-linked list? [Interview]
Dated: Tue Dec 27 06:49:35 IST 2005
1 node* reverse_list(node *list)
2 {
3 node *rev=NULL;
4 while(list !=NULL) {
5 node *t = list->next;
6 list->next = rev;
7 rev = list;
8 list = t;
9 }
10 return rev;
11 }
How To Speed Up Firefox [Howto]
Here's something for broadband people that will really speed Firefox up:
1.Type "about:config" into the address bar and hit return. Scroll down and
look for the following entries:
network.http.pipelining network.http.proxy.pipelining
network.http.pipelining.maxrequests
Normally the browser will make one request to a web page at a time. When you
enable pipelining it will make several at once, which really speeds up page
loading.
2. Alter the entries as follows:
Set "network.http.pipelining" to "true"
Set "network.http.proxy.pipelining" to "true"
Set "network.http.pipelining.maxrequests" to some number like 30. This means
it will make 30 requests at once.
3. Lastly right-click anywhere and select New-> Integer. Name it
"nglayout.initialpaint.delay" and set its value to "0". This value is the
amount of time the browser waits before it acts on information it recieves.
If you're using a broadband connection you'll load pages MUCH faster now!
Vaibhav.
How to Export sound in Linux [Howto]
Exporting sound :-
Run 'artsd -n -u -p 5001' on system on which u want to hear sound.
Run 'export ARTS_SERVER=ip_of_system_on_which_sound_it_to_be_heard:5001'
on system where sound application will be run (like mplayer)
Run 'mplayer -ao arts soundfile.mp3'
Monday, May 29, 2006
Vim Movements
Moving Around
k (up),
h(left) l (right).
j (down)
(Ex 5k,j,3l )
Word Movement
w (Forward Word Movement Ex. f,5f )
b (Backword Word Movement Ex. b,2b)
e (Forward Word Movement at the end of word Ex. e,3e )
ge (Backword Word Movement at the end of word Ex. ge,3ge )
Moving to the Start or End of a Line
$(End Of Line Ex. $,2$)
^(Start Of Line Ex. ^,3^)
Searching Along a Single Line
f<Charcter> (Searching Charcter Forward Ex. fa, 2fv)
F<Charcter> (Searching Charcter Backword Ex. Fg,2Ft)
t<Charcter> (Search till Forward )
T<Charcter> (Search till Backword)
Moving to a Specific Line
<Line No.>G (Go to Line No.)
CTRL-G (Where I am in the File)
g CTRL-G (Count col, line, words and bytes)
CTRL-O Jump to previous location.
<TAB> Jump to next location (line 10).
Where are you in File
:set number
:set nonumber
Scrolling Up and Down
CTRL-U (scrolls up half a screen of text.)
CTRL-Y (scrolls up a line of text.)
CTRL-B (scrolls up a entire screen at a time.)
CTRL-D (scrolls down half a screen of text.)
CTRL-E (scrolls down one line.)
CTRL-F (scrolls down one screen of text.)
z<Enter> (screen line on the top)
88z<Enter> positions line 88 at the top.
zt (Leaves the cursor where it is.)
z- (scrolls line to the end of the screen)
zb (Leaves the cursor where it is)
z. (Center of the screen)
zz (Leaves the cursor where it is .)
:set scroll=10
:set scrolljump=5
:set scrolloff=3
Deleting
x delete character under the cursor (short for "dl")
X delete character before the cursor (short for "dh")
dw (Delete Word Ex. dw,3dw,d3w,3d2w,d$,d^,df> )
dd (Delete Line Ex. dd,3dd)
D (Delete up to end of line. )(short for "d$")
diw delete word under the cursor (excluding white space)
daw delete word under the cursor (including white space)
dG delete until the end of the file
dgg delete until the start of the file
Arthemetic
CTRL-A Incrmenting Number (123, 0177, 0x1f,-98)
CTRL-X Decrementing Number
:set nrformats=""
Changing Text
cw (Change Word Ex cw,c2w)
C stands for c$ (change to end of the line)
s stands for cl (change one character)
S stands for cc (change a whole line)
The . Command
It repeats the last delete or change command.
Joining Lines
J (Join Lines to One. Ex J,3J)
gJ (Join Lines without Spaces)
Replacing Charcter
r<Charcter> (Replace Charater Under Cursour. Ex. ru,5ra,3r<Enter> )
R<Charcter>
Changing Case
~ (Change Case of Character Ex. ~,12~,~fq)
U (Make the text Uppercase)
u (Make the text Lowercase)
g~motion (It does not depend on tildeop)
g~~ or g~g~ (Changes case of whole line)
gUmotion (All uppercase)
gUU (Changes to uppercase for whole line)
gUw (Changes to uppercase for word)
guw (Changes to lowercase for word)
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