<caption><image_19>The image is a screenshot of a computer screen with a message on it. The message reads "Welcome to Berkeley Decision/System's System Administrator is rich. Have a great day. $ cat phsmith grep 'Smith' phone.list $". The message is written in green text on a black background.</caption><caption><image_20>The image is a still from a television interview. It shows a man sitting at a desk in front of a computer. He is wearing a white shirt and a maroon tie. He has a beard and is looking directly at the camera with a serious expression. Behind him, there is a bookshelf filled with books and a computer monitor. The background is a plain white wall.</caption> called ph smith as you see the file contains a grep command which will search for the word smith at the beginning of the phone list basically looking for people whose last names begin with smith to execute this command i simply type the name of the file that holds the command that I want to execute the output is the same as if I'd entered the grep command that's stored in the file on the command line this provides us a great deal of power because in addition to simply executing commands the shell also has a programming language that will allow us to write advanced applications I'll demonstrate some of those as we go through this course one problem that the pH Smith file has is that it always searches for the same person's name it'd be much more useful if I could get it to search for any pattern that I entered on the command line along with the name of the file to do this the shell has to be able to take arguments off the command
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