파일타입 "p" (prwx------)

prwx

The first character in the string is reserved for the file type

d directory p pipe/fifo l link c character device file b block device file s local domain socket

 

Named pipe[edit]

Main article: Named pipe

One of the strengths of Unix has always been inter-process communication. Amongst the facilities provided by the OS are pipes. These pipes connect the output of one process to the input of another. This is fine if both processes are living in the same parent process space, started by the same user. There are however circumstances where the communicating processes must use named pipes. One such circumstance is that the processes have to be executed under different user names and permissions.

These named pipes are special files that can exist anywhere in the file system. These named pipe special files are made with the command mkfifo as in mkfifo mypipe.

A named pipe is marked with a p as the first letter of the mode string, e.g.

prw-rw---- ... mypipe

 

참고 : http://unix.stackexchange.com/questions/20692/knowing-privilege-rights-on-a-file-in-linux

http://en.wikipedia.org/wiki/Unix_file_types