Video To Mp3 (online)

You have come across situation where you are watching a video and you intend to download the mp3 of that video.Here is the simple solution .The website for taking out the mp3 from video is  video2mp3 . Take note of url of that video or copy that link from your address bar and paste it in the area named Video URL. The screenshot from the website :

Choose from either standard quality or high quality and click convert. It takes few minutes . Wait for 20 seconds or click on their Download Mp3 link.

For formats other than Mp3 like AAC/WMA/M4A/OGG/MP4/3GP/AVI/MPG/WMV/FLV use their other website ClipConverter

Remove Directory command

Removes directory when contents inside it are empty :

           

rmdir directory_name

Delete all the contents including contents of sub-directory with out the prompt message,in simple recursive delete without prompt :

           

rm -rf directory_name

recursive delete with prompt messages :

           

rm -r directory_name

Using Unzip command to unzip files

Preserving directory and sub-directory :

           

unzip file_name.zip

Include all junk path names without preserving directory structure :

           

unzip -j file_name.zip

Specify the name of the directory where you want to unzip :

           

unzip file_name.zip -d directory_name

Checking Disk space

The command used to check disk space :

           

df

df stands for " disk file system " using -h along with df shows the disk space in human readable form .

           

df -h

Uncompress and open tar.gz files

To Uncompress the tar.gz file the command used :

           

gunzip  -d  Name_of_file.tar.gz

The resulting file would be Name_of_file.tar .To open that tar file the commnand used:

           

tar  -xvf  Name_of_file.tar

RPM - RPM package manager

Here are the few commands relating to rpm package from installing to deleting and few others . The commands are :

1) Installing rpm package :

• single package

rpm -i PackageName.rpm

• multiple package

rpm -i PackageName1.rpm PackageName2.rpm ... .rpm

2) To check installed rpm packages :

rpm -qa PackageName*

Note  :  here * is a wildcard character which displays all names ,it does pattern matching.

3) To  delete the installed rpm packages :

           

rpm  -e  PackageName

Note  :  here (.rpm ) is not used while deleting packages

Enabling port 8000 or 80 on Linux

A very simple method to check whether the port is working or not is , type the following at console :

telnet your_ip port_number (which u want to check)

telnet  192.168.1.2  8000

if you are able to connect it or can see a blank screen means the port is "open".

if not then change the firewall settings , do the following :

• check the : vi  /etc/sysconfig/iptables 

      You should find  :
   
      -A RH-Firewall-1-INPUT -m state NEW -m tcp --dport 21 -j ACCEPT
      -A RH-Firewall-1-INPUT -m state NEW -m tcp --dport 22 -j ACCEPT

     See if there is --dport 80 or 8000 or anyport which you want to access , if not add the following entry to iptables changing the --dbport to whichever port you want to open.

         

-A RH-Firewall-1-INPUT -m state NEW -m tcp --dport 80 -j ACCEPT

 restart the iptables service by :            

service  iptables   restart

hope this works , !!!!!!!

 Note : Its not limited to port 80 or 8000 ,its applicable to any ports