How does a FIFO (named pipe) differs from a regular pipe (|)? As I understand from Wikipedia, unlike a regular pipe, a FIFO pipe "keeps living" after the process has ended and can be deleted sometime afterwards.

But if f the process is based on a shell command containing a pipe (cat x | grep y), we could "keep it alive after the process" if we store it in a variable or a file, isn't it then a FIFO?

Also, a regular pipe also has the first stdout it gets, as stdin for another command, so isn't it also a kind of first in first out pipe?

How does a FIFO (named pipe) differs from a regular pipe (|)? As I understand from Wikipedia, unlike a regular pipe, a FIFO pipe "keeps living" after the process has ended and can be deleted sometime afterwards.

But if f the process is based on a shell command containing a pipe (cat x | grep y), we could "keep it alive after the process" if we store it in a variable or a file, isn't it then a FIFO?

Also, a regular pipe also has the first stdout it gets, as stdin for another command, so isn't it also a kind of first in first out pipe as well?

How does a FIFO (named pipe) differs from a regular pipe (|)?

  As I understand from Wikipedia this pipe "keeps living" after the process was ended and can be deleted sometime afterwards.

I don't understand what is the meaning of keep living after a process - I can't think of regular pipes in that way, I'll explain:

If the process is based on a shell command containing a pipe (cat x | grep y), we can just write it again (or, expand it from a variable). If the process is based on running a file with a script with 1 or more commands, well, the code is already in the file, so what is the meaning of keep being alive after the process was ended that I cannot imagine for a regular pipe in a command?

How does a FIFO (named pipe) differs from a regular pipe (|)? As I understand from Wikipedia, unlike a regular pipe, a FIFO pipe "keeps living" after the process has ended and can be deleted sometime afterwards.

But if f the process is based on a shell command containing a pipe (cat x | grep y), we could "keep it alive after the process" if we store it in a variable or a file, isn't it then a FIFO?

Also, a regular pipe also has the first stdout it gets, as stdin for another command, so isn't it also a kind of first in first out pipe?