Wicked Cool Shell Scripts by Dave Taylor

By Dave Taylor

Enjoyable and useful Linux, Mac OS X and UNIX shell scripts

The UNIX shell is the most scripting setting of each Linux, Mac OS X and UNIX process, even if a rescued machine or a million-dollar mainframe. This cookbook of priceless, customizable, and enjoyable scripts supplies the instruments to unravel universal Linux, Mac OS X and UNIX difficulties and customize your computing setting. one of the greater than a hundred scripts incorporated are an interactive calculator, a spell checker, a disk backup application, a climate tracker, and an internet logfile research device. The e-book additionally teaches you ways to put in writing your personal subtle shell scripts by means of explaining the syntax and methods used to construct each one instance scripts. Examples are written in Bourne Shell (sh) syntax.

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It does this by examining the very first character of the given value to see if it’s a “/” or not; hence the need to isolate the first character from the rest of the variable value. If this POSIX notation is too funky for you, Bash and Ksh support another method of variable slicing. The substring function ${varname:start:size} requests a certain number of characters from varname specified by size and beginning with the character number in varname specified by start. For example, ${varname:1:1} would produce a substring consisting of just the first character of varname.

Billing itself as an arbitrary-precision calculator, the bc program harkens back to the very dawn of Unix, with its cryptic error messages, complete lack of prompts, and assumption that if you’re using it, you already know what you’re doing. But that’s okay. We can cope. /bin/sh # scriptbc - Wrapper for 'bc' that returns the result of a calculation. book Page 30 Monday, December 15, 2003 11:27 AM How It Works This script demonstrates the useful here document capability in shell scripting. The << notation allows you to include material in the script that is treated as if it were taken directly from the input stream, which in this case allows an easy mechanism for handing commands to the bc program.

Normdate 8 3 1962 Aug 3 1962 $ normdate AUGUST 3 1962 Aug 3 1962 Hacking the Script Before you get too excited about the many extensions you can add to this script to make it more sophisticated, check out Script #7, which uses normdate to validate input dates. book Page 18 Monday, December 15, 2003 11:27 AM $ normdate 8/3/1962 Aug 3 1962 #4 Presenting Large Numbers Attractively A common mistake that programmers make is to present the results of calculations to the user without first formatting them.

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