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What are Pipes? Explain use of pipes.A pipe is a chain of processes so that output of one process (stdout) is fed an input (stdin) to another. UNIX shell has a special syntax for creation of pipelines. The commands are written in sequence separated by |. Different filters are used for Pipes like AWK, GREP.
e.g. sort file | lpr ( sort the file and send it to printer)
Uses of Pipe
- Several powerful functions can be in a single statement
- Streams of processes can be redirected to user specified locations using > What are Pipes? Explain use of pipes.Pipe is a symbol used to provide output of one command as input to another command. The output of the command to the left of the pipe is sent as input to the command to the right of the pipe. The symbol is |.
For example:
$ cat apple.txt | wc
In the above example the output of apple.txt file will be sent as input for wc command which counts the no. of words in a file. The file for which the no. of words counts is the file apple.txt.
Pipes are useful to chain up several programs, so that multiple commands can execute at once without using a shell script.
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