Command-line essentials When you ssh into a Unix-like system, the system looks up your user account information and spawns a new shell process based on your preferences.

It is easy to dismiss bash — the typical Linux shell program — as just a command prompt that allows scripting. Bash, however, is a full-blown programming language. I wouldn’t pres… ...

Several methods to add menus and progress bars to shell scripts are explained. Floating-point math, number conversion and generation of random passwords and numbers also are covered. The volume ends ...