strange file

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# 1  
Old 01-10-2002
strange file

Hi everybody,

Does anyone knows what is that strange file below:"disk_query"
?? What else does we know about it and how big is it?


# uname -a
HP-UX coolp01 B.10.20 A 9000/785 2014535552 two-user license
# pwd
# ls -l
total 158
-rw-rw-rw- 1 root sys 0 Jan 4 13:06 auto.master
-rw-r--r-- 1 root root 67411 Jan 4 13:05 boot.config
-rw-rw-rw- 1 root sys 29 Jan 8 15:56 coolp01.dion
-rw-rw-rw- 1 root sys 4785 Jan 8 15:56 coolp01.iout
-rw-rw-rw- 1 root sys 4785 Jan 8 15:53 coolp01.iout.old
crw------- 1 root sys 188 0x036000 Jan 4 13:06 disk_query
drwxrwxrwx 2 bin bin 1024 Jan 8 16:08 lock
dr-xr-xr-x 2 bin bin 1024 Jan 8 16:08 log
dr-xr-xr-x 2 bin bin 96 Aug 20 09:21 preferences
dr-xr-xr-x 2 bin bin 96 Aug 20 09:21 rt
dr-xr-xr-x 3 bin bin 96 Aug 20 09:21 ug

# 2  
Old 01-10-2002
That is a "Character Special File". In UNIX, everything is a file, The Keyboard, The Mouse, The Printer, .... UNIX communicates with any of these devices in "blocks of bytes" or "byte-by-byte". When it communicates with these devices on "byte-by-byte" basis, the file is a "Character Special File" (Exs: Keyboard, Mouse, ...). See the /dev directory for a better understanding.

Type file disk_query to get more information on the file. These files virtually occupy no space.

Special files
Special files represent input/output (i/o) devices, like a tty (terminal), a disk drive, or a printer. Because Unix treats such devices as files, a degree of compatibility can be achieved between device i/o, and ordinary file i/o, allowing for the more efficient use of software. Special files can be either character special files, that deal with streams of characters, or block special files, that operate on larger blocks of data. Typical block sizes are 512 bytes, 1024 bytes, and 2048 bytes.
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