My Little Tips

2013-07-19 16:09:00 +0000

1.How to copy between two terminals using vim?

1.open file a
2.copy the items (using yy)
3.close file a (Main point)
4.open file b
5.paste the items
6.save and exist file b

2.How to open a url in python

url = urllib2.quote(url.encode("utf8"))

3.How to load json in python

f = urllib2.urlopen(url)
ff = f.read()
jdata = simplejson.loads(ff)

Or

f = urllib2.urlopen(url)
jdata = simplejson.load(f)

4.How to reverse a Hash table in ruby

1.convert the Hash to an Array 2.reverse the Array 3.convert the Array to a Hash 

reversed_h = Hash[h.to_a.reverse]

5.How to view the System version

cat /etc/issue

6.How to unzip xx.tar.bz2 file

unzip xx.tar.bz2
bzip2 -d xx.tar.bz2 ===> xx.tar
tar -xvf  xx.tar ===> xx

7.Why markdown List don’t work correctly with Chinese

code

1. 得到这个世界中已经创建好的账
2. 不断接收这个世界被广播出
3. 猜一个幸运随机

result

  1. 得到这个世界中已经创建好的账
  2. 不断接收这个世界被广播出
  3. 猜一个幸运随机

Don’t work as we wish. _I found when there is an Endlish word or a digit it would work fine._

code

1. 得到这个世界中已经创建好的账x 
2. 不断接收这个世界被广播出23
3. 猜一个幸运随机n

result

  1. 得到这个世界中已经创建好的账x
  2. 不断接收这个世界被广播出23
  3. 猜一个幸运随机n

8.How to get public key?

Don’t have one

guest-K9BGsj@ubuntu:~$ ssh-keygen 
Generating public/private rsa key pair.
Enter file in which to save the key (/tmp/guest-K9BGsj/.ssh/id_rsa): 
Created directory '/tmp/guest-K9BGsj/.ssh'.
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /tmp/guest-K9BGsj/.ssh/id_rsa.
Your public key has been saved in /tmp/guest-K9BGsj/.ssh/id_rsa.pub.
The key fingerprint is:
ff:99:ec:33:35:ae:d8:8a:9f:20:06:13:11:1b:56:e6 guest-K9BGsj@ubuntu
The key's randomart image is:
+--[ RSA 2048]----+
|    =oo          |
|   . *           |
|    o E          |
|     .           |
|    o   S        |
|     o   .    o  |
|      o . .  o . |
|     . . o *oo.  |
|        ..=oO+   |
+-----------------+
guest-K9BGsj@ubuntu:~$

Have one

guest-K9BGsj@ubuntu:~$ cd .ssh/
guest-K9BGsj@ubuntu:~/.ssh$ ls
id_rsa  id_rsa.pub
guest-K9BGsj@ubuntu:~/.ssh$ cat id_rsa.pub 
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDGiRONM/cuVGJxcTDSdPbs8WvnGNSKbxIZtK5pX8CIlSXl8+k67GOJygk5QO2uTp35+SohVHS9z4+4grTmVSBLKrDTv6eE0p9H0WV0RUJZsfoS+GG6aa+Omc8pweG/WsDzcDzUpFzCRz+BT7iQs+AXE/mdKgTjm0aRmBSLkpq0pXYmp49WK205MCInD5tiKd9o8CTrmXhy31IjO4qa8Nh+lJ9NYHvA4TH4fBSTAkYyzz12uymfmQ4J5ZeLxmLZDBbm7V7fJQZwNe4uKKUu0DeQ3gvVBZqqjnbTXJm2qR1sMPM9393EtP+E20FskgE9g3lONxA7ZtR8nW7SUyvGLWzN guest-K9BGsj@ubuntu
guest-K9BGsj@ubuntu:~/.ssh$

9.How to ssh and get a file form the host

Login to the server using ssh

lo@ubuntu:~$ ssh aaa@10.10.7.41
aaa@10.10.7.41's password: 
Linux 111012d102 2.6.35-32-server #67-Ubuntu SMP Mon Mar 5 21:13:25 UTC 2012 x86\_64 GNU/Linux
Ubuntu 10.10

Welcome to the Ubuntu Server!
 * Documentation:  http://www.ubuntu.com/server/doc
New release 'natty' available.
Run 'do-release-upgrade' to upgrade to it.

Last login: Wed Aug  7 17:38:51 2013 from 120915d101.aaa.com
aaa@111012d102:~$

Get the file from sever using scp

lo@ubuntu:~$ scp aaa@10.10.7.41:/directory/to/somefile ./
aaa@10.10.7.41's password: 
somefile		100% 1675     1.6KB/s   00:00    
lo@ubuntu:~$

10.Copy and Paste from terminal with keyboard in linux

`shift` + `ctrl` + c		#to copy
`shift` + `ctrl` + v		#to paste