<caption><image_76>The image is a still from a video. It shows a man standing in front of a desk with a computer monitor and other office supplies on it. He is wearing a white collared shirt and a dark tie. He has a beard and is looking directly at the camera with a serious expression. Behind him, there is a framed picture hanging on the wall. The image appears to be taken in an office setting.</caption> of the dollar sign when it's in front of a variable name and the back quotes in this case the shell did substitution for F name L name and pH number but left the tab the space and the comma has it double quotes are commonly used like single quotes however double quotes allow the shell to substitute for variables while pH ad works it doesn't work very well the problem is that it only allows me to enter one name per execution of the script if I want to enter another name I have to re-execute pH ad in fact I'd have to run pH at once for each name I wanted to enter this is inconvenient and I prefer that the script continue to prompt me for names until I had no more to enter this will require that we add a loop to pH n we can't use the for loop because the for loop only works if I know how many times I want to loop before I start it's much more convenient if pH add quits when I'm done without me telling it how many names I want to enter to begin with the shell has another kind of loop that we can use in this instance it's called
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