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How does a pipe differ from the other forms of redirection?
The both do the same basic thing; they redirect a file descriptor of the process executed. The difference lies in how. A pipe connects the stdout of one process to the stdin of another, whereas redirection redirects from/to a file ( > from stdout to a file, < from a file to stdin).
What is the key difference between a redirection (>) and piping to the tee command?
Redirection is (mostly) for files (you redirect streams to/from files). Piping is for processes: you pipe (redirect) streams from one process to another. Essentially what you really do is “connect” one standard stream (usually stdout ) of one process to standard stream of another process (usually stdin ) via pipe.
How are pipes used in stdin and stdout?
The pipe(line) A more interesting application of the STDIN/STDOUT is to chain commands together. The output of the first command becomes the input of the second command. Imagine the following chain: The contents of the file /var/log/syslog are sent (as input) to the grep command.
How to pipe stdout and stderr into one filter?
In other words, you want to pipe stdout into one filter ( tee bbb.out) and stderr into another filter ( tee ccc.out ). There is no standard way to pipe anything other than stdout into another command, but you can work around that by juggling file descriptors.
Is there a way to pipe stdout into another command?
There is no standard way to pipe anything other than stdout into another command, but you can work around that by juggling file descriptors. See also How to grep standard error stream (stderr)? and When would you use an additional file descriptor?
How is the output of a pipe redirected?
Pipe redirects the command’s output to the next command. Only the 9th string (separated by whitespace) will be displayed at the end of the line containing 10. The example above shows the pipe’s usefulness and how some commands can be joined together.