unix

20pts) Use fork/). ereclp (or equivalent), dup2 pipe) and open to execute the shell command" pe grep pat > output where "output" is the name of a file. Note that your code should execute this specific command only (no parsing). Also you can assume that file "output" already exists. 20pts) Use fork/). ereclp (or equivalent), dup2 pipe) and open to execute the shell command" pe grep pat > output where "output" is the name of a file. Note that your code should execute this specific command only (no parsing). Also you can assume that file "output" already exists