How do I empty a directory (delete all files) under Linux / Unix without deleting directory itself?
A dot-file is generally any file whose name begins with a full stop. In Linux or Unix like operating system it is also called as hidden file. How do I list all dot files in my home directory?
How do I check whether a directory is empty or not under Linux / UNIX using a TCSH / C shell script?
How do I remove a user’s access from my server? How do I delete a user account under Linux operating systems?
I‘ve downloaded Backtrack Linux version 5 KDE desktop 64 bit. To start a graphical interface I’ typed startx command. But it failed with the following error message:

How do I fix this problem and install Backtrack Linux version 5 KDE desktop on my hard disk?
I‘m an extreme newbie to the Linux world, but any time I try to get play files according to a playlist file using mplayer command line it turns up this error:
$ mplayer playlist.m3u
MPlayer SVN-r1.0~rc3+svn20090426-4.4.3 (C) 2000-2009 MPlayer Team
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.
Playing playlist.m3u.
Cache fill: 0.00% (44 bytes)
Exiting… (End of file)
How do I fix this and play music without using GUI tools?
How do delete multiple files in bulk (say all *.bak file stored in /netapp/ and its subdirectory) under Linux / UNIX operating systems?