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Full Discussion: Creating a config file with specified parameters
Top Forums Shell Programming and Scripting Creating a config file with specified parameters Post 303025509 by bakunin on Sunday 4th of November 2018 02:55:10 PM
Old 11-04-2018
Quote:
Originally Posted by multiverse22
I want to create a config file that has parameters that can be specified using - or -- (without an equals sign), as well as the ability to output the file using - or --. Could somebody point me to a generic script to do this?
You might want to investigate getopts to parse the command line, which will do a lot of the "cooking" already (tokenizing by word splitting, for instance). It will, nevertheless, restrict you to a predefined set of options you can pass this way. You can predefine it yourself but then you will have to stick with it (unless you chang the script). So the question is: is that sufficient for your purposes or not?

If it is, you might want to acquaint yourself with getopts first and then ask specific questions if you still need help. If this is not sufficient for your purpose, then i suppose you are on your own and i wouldn't know of any "generic" script you could use. You should perhaps start by deciding what your config files should look like:

- do you want to allow commentaries like this:
Code:
alpha = 1
# this is a line to be ignored
beta = 2

- do you want to allow inline commentaries like this:
Code:
alpha = 1     # this is a comment
beta = 2      # this is another comment

It is easy to dismiss such comments as unnecessary and complicating things but when you have longer complex configs you might want to have some comments explaining inplace why something is what it is and what were your reasons to put it there.

- will you need "chapters" in these config files, like in the Windows init-files-style:
Code:
[part1]
alpha =  1
beta = 2

[part2]
gamma = 3
delta = 4

and perhaps many more questions. You should, before trying to write a script, first define E-X-A-C-T-L-Y how the files you want to produce should look like. Decisions like this will not be easily corrected once you start programming and may well mean that you throw away a script that is already "almost" working and start anew.

I hope this helps.

bakunin
 

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LEARN ABOUT CENTOS

zlarfgp.f

zlarfgp.f(3)							      LAPACK							      zlarfgp.f(3)

NAME

       zlarfgp.f -

SYNOPSIS

   Functions/Subroutines
       subroutine zlarfgp (N, ALPHA, X, INCX, TAU)
	   ZLARFGP generates an elementary reflector (Householder matrix) with non-negatibe beta.

Function/Subroutine Documentation
   subroutine zlarfgp (integerN, complex*16ALPHA, complex*16, dimension( * )X, integerINCX, complex*16TAU)
       ZLARFGP generates an elementary reflector (Householder matrix) with non-negatibe beta.

       Purpose:

	    ZLARFGP generates a complex elementary reflector H of order n, such
	    that

		  H**H * ( alpha ) = ( beta ),	 H**H * H = I.
			 (   x	 )   (	 0  )

	    where alpha and beta are scalars, beta is real and non-negative, and
	    x is an (n-1)-element complex vector.  H is represented in the form

		  H = I - tau * ( 1 ) * ( 1 v**H ) ,
				( v )

	    where tau is a complex scalar and v is a complex (n-1)-element
	    vector. Note that H is not hermitian.

	    If the elements of x are all zero and alpha is real, then tau = 0
	    and H is taken to be the unit matrix.

       Parameters:
	   N

		     N is INTEGER
		     The order of the elementary reflector.

	   ALPHA

		     ALPHA is COMPLEX*16
		     On entry, the value alpha.
		     On exit, it is overwritten with the value beta.

	   X

		     X is COMPLEX*16 array, dimension
				    (1+(N-2)*abs(INCX))
		     On entry, the vector x.
		     On exit, it is overwritten with the vector v.

	   INCX

		     INCX is INTEGER
		     The increment between elements of X. INCX > 0.

	   TAU

		     TAU is COMPLEX*16
		     The value tau.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Definition at line 105 of file zlarfgp.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2							  Tue Sep 25 2012						      zlarfgp.f(3)
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