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What Is the Bash Shell, and Why Is It So Important to Linux? What Is a Shell? When you open a terminal window and type commands, something has to take what you’ve typed, figure out what you intended, and run the tasks you asked for. The software that does this is the shell. A shell is a command interpreter. It scans what you’ve typed and picks out the commands, directory names, file names, and program names so that it can figure out what you’re trying to achieve. People often use the phrases “terminal windows,” “command line,” and “shell” interchangeably, but they’re thre...

_shellmath_add 1.009 4.223e-2 _shellmath_getReturnValue sum echo "The sum is $sum" Addition and multiplication are of arbitrary arity; try this on for size: _shellmath_multiply 1 2 3 4 5 6 _shellmath_getReturnValue sixFactorial echo "6 factorial is $sixFactorial" Subtraction and division, OTOH, are exclusively binary operations. The demos shellmath run the demo $ slower_e_demo.sh 15 e = 2.7182818284589936 This script uses a few shellmath API calls to calculate e, the mathematical constant also known as Euler's number. The argument 15 tells the script t...