Linux and Unix rm command help and examples

rm (short-name for remove) is a command used to remove objects such as files, directories, device nodes, symbolic links etc from the file-system. rm also remove the reference of objects. It works on Linux as well on Unix.

In Actual, rm does not remove any object (file, directories and nodes etc), It just unlink the object from filesystem. That's why file system space may still contain leftover data from the removed file.

Following are rm commands with example.
Delete a single file.

rm filename

Delete all files [USE WITH EXTENSIVE CARE].

rm *

Delete all files which have .txt extension.

rm *.txt 

Delete all files which start with "data" text.

rm data*

Delete a folder (folder must be empty).

rm -d foldername

Delete all recursively. (d-directory, r-recursive).

rm -dr foldername

Delete a file forcefully and will not prompt.

rm -f  filename

Delete the files with prompt (d-directory, r-recursive, i-Prompt before every removal).

rm -dri foldername

Delete the files  without prompt (d-directory, r-recursive, f-without prompt).

rm -drf foldername

Delete the files with without prompt (d-directory, r-recursive, f-without prompt)

rm -drf foldername

Delete the files with single prompt (d-directory, r-recursive, I-single prompt)

rm -drI foldername

Delete the files with details (d-directory, r-recursive, v-explaination)

rm -drv foldername

Delete a file which exist in another folder.

rm /mnt/data/home/project1/public_html/filename.txt 

When we are using multiple options in command, see following:
1) We can exchange the position of option  (Make no difference)
2) We can also give "-" again each option parameter.
3) To Delete a directory recusively, Following commands are valid and are same.

rm -dr foldername
rm -rd foldername
rm -d -r foldername
rm -r -d foldername

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How To Track the Real IP Address Behind the Proxy - PHP - REMOTE_ADDR

IP Address: It is unique address of the client machine by which we track the user detail requesting for some request. Full Fom of IP Address is Internet Protocol Address. today, Almost all person know about the ITp Address. This is basically used for tracking.

For Example, If you send an email with your computer. Communication is done on the behalf of IP Address.

Get the Unique IP Address of client machine

function get_ip_address(){
 if ( !empty($_SERVER['HTTP_CLIENT_IP']) )  //check ip from share internet
 {
   $ip = $_SERVER['HTTP_CLIENT_IP'];

 }elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))   //to check ip is pass from proxy
 {
   $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];

 } else  {

   $ip=$_SERVER['REMOTE_ADDR'];
}

 return $ip;
}

echo get_ip_address();

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