If you are a Linux administrator, scripting can make your life easier by allowing you to automate routine tasks, customize jobs, and connect different utilities. This article looks at Bash, the default command shell on most Linux distributions.
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Linux Shells and Utilities Get to know Bash
Any Linux administrator who wishes to remain sane relies heavily on scripting to automate routine tasks, customize jobs, and build the plumbing that connects the different utilities that make a Linux system run smoothly. The Linux world is chock-full of scripting languages: Perl, Python, PHP, Scheme, Tcl, Tk, Ruby, Forth, Smalltalk, Eiffel, and doubtless many more. To get the column started, we'll look at shell scripting with Bash, and scripting with Python and Perl.
Understanding what Bash does is fundamental to using Linux. Bash is a command interpreter, the direct interface between you and your Linux system. Python is easy-to-learn, yet capable of handling any system administration chore. Perl is endlessly flexible, which makes learning it rather vexing at times. But it can do almost anything: Complex programs are written in Perl, such as the indispensible game Frozen-Bubble.
Scripting and text-and-file processing go hand-in-hand. So we'll also incorporate regular expressions, awk, sed, find, sort, uniq, and other text-and-file processing utilities. Half of using Linux is simply learning all these odd little specialized commands. Here is where the real power of Linux/Unix lies: All these little, specialized programs can be strung together in any way you need. You're not limited by some program author's idea of what you need, so you can use these building blocks to construct your Linux house the way you like it.
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