Shell Programming and Scripting

What are the default access privileges set for a FIFO.?
How can we change read and write privileges for a FIFO?
what are the commands for this above question ?

The commands are:

Code:

man mkfifo
man chmod

fifo's are nothing more than files. stat (either the system call, or the the stat command (Linux) or ls -l) gives you the same kind of information about the file.

Oddly enough not all OSes give a filesize result that has the same meaning. Which is probably due to implementation differences.
From solaris man page for stat:

Code:

st_size	     For regular files, this is the address of the end of  the
		     file. For block special or character special, this is not
		     defined. See also pipe(2).

Linux stat man page defines no such limitation. (struct stat) st_size works out to be the number of unread bytes living in the fifo when the stat call is made. (See tstat.c p. 283 example code in M Kerrisk 'The LINUX Programming Interface', which is derived originally from Ed 1 of Stevens).

Therefore you can use stat or ls -l to get file metadata information about a fifo.