Check if a file is really a file, whether a string contains anything, and whether you can run a program with these vital patterns.

One of the most universal experiences of any Linux or Unix user is working through a guide or handbook and coming across an almost unbelievably complex line of code meant to be executed with a shell.

I'm passing a file to my script and then I need to get into a for loop until all the lines are read and manipulated, but what was the simple syntax for reading each line of the inputed file? (assuming ...