Because it's used in the real world all the time? The amount of times I've had to write my own sorting algorithm in my career: 0. The amount of grep/sed/awk I

Because it's used in the real world all the time? The amount of times I've had to write my own sorting algorithm in my career: 0. The amount of grep/sed/awk I've used? Countless. Someone who is familiar with how powerful and flexible these tools are is likely to accomplish something that can benefit from them quicker than someone who isn't aware of them. Also in my experience software devs that shy away from the command line because they don't like it rarely pan out.