<P> A symbolic link is marked with an l (lower case L) as the first letter of the mode string, e.g. </P> <P> 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 . </P> <P> 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 . </P> <P> A named pipe is marked with a p as the first letter of the mode string, e.g. </P>

Difference between regular file and pipe file in unix
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