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Top Forums Shell Programming and Scripting Calculate difference between consecutive data points in a column from a file Post 302460883 by malandisa on Thursday 7th of October 2010 10:56:00 PM
Old 10-07-2010
Thank you both Danmero and rdcwayx!

I want to make this a learning experience so please be patient with me!

rdcwayx's gives what I am looking for! danmero's approach makes everything positive (but is actually doing the difference just fine, only that it makes it positive) ....somehow I have no clue what is happening in this command! I have some idea what is happening in rdcwayx's command! Thank you again!! I am surely learning shell scripting here, I actually doubted this was possible with awk!!!

daanmero please can I ask a favour that you just explain what the different symbols actually mean and how that combination achieves the result? and is it possible to modify the command so that it preserves the negative in the results? and any advice where I can find a detailed user guide for awk that?

Thank you all!
 

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ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
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