1. Pipe's function:
The output of each command in the pipeline is connected via a pipeto the input of the next command. That is, each command reads the previous command's output. Thisconnection is performed before any redirections specified by thecommand.
2. Note: If ‘|&’ is used, the standard error of
command1 is connected tocommand2's standard input through the pipe; it is shorthand for2>&1 |
. This implicit redirection of the standard error isperformed after any redirections specified
by the command.
3. Each command in a pipeline is executed in its own subshell
4.