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Pipes

The | specifies that all stdout is to be piped as stdin into the next command. 

Examples:

  cd /lib
  ls -l | more
  ls -l | grep read
In the context of input-output chaining with pipes
Unix commands can be interpreted as input-output filters.

tee: Read from stdin and write to stdout and files. 

Example:

  cd /lib
  ls -l | tee /tmp/All_ls_Output | grep read