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Top Forums UNIX for Dummies Questions & Answers Display header in script output Post 302863553 by Decoy Octopus88 on Monday 14th of October 2013 02:52:08 PM

10-14-2013

Registered User

Display header in script output

Hi -- Working on my own through the book "Learning the KornShell and came to task 4-1, which there is:
a script "highest" and it will sort an "album" file.
highest filename

The author mentions adding a header line to the scripts output if the user types in the -h option. It says "assume the option ends up in the variable "header" i.e $header is -h"

If user runs the script with -h, it will produce a header on the output that reads "Album Artist" and a new line" if the -h option is not used there is no header or new line.

From the book:
The expression
${header:+"Albums Artist\n")
yields null if the variable header is null or "Albums Artist\n" is not null.
we can put the line:
print -n ${header:+"Albums Artist\n"}

My problem is i do not know how to make $header relate to the -h option. It says "assume....." but i want to follow along and run the script. Tried the man pages, but no luck. If you have any ideas please respond. Thanks.

Decoy Octopus88

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LEARN ABOUT DEBIAN

dfits

dfits(1)						      General Commands Manual							  dfits(1)

NAME

       dfits - display FITS file header information

SYNOPSIS

       dfits [-x xtnum] <list>
       dfits [-x xtnum] -

DESCRIPTION

       dfits  displays FITS header informations on stdout. Header information can be found in the main header only (default), in extensions, or in
       both.  See the -x option below.	dfits accepts multi-file input.  'dfits -' expects single file data coming from stdin.	dfits also accepts
       now 'HDR' files. These are identified from the fact that they contain a line feed in one of the 80 first characters.

OPTIONS

       -x xtnum
	      Specifies the extension to print out. Extensions are numbered starting from 1. If this option is not specified, only the main header
	      is printed out. If this option specifies an extension that does not exist, nothing is printed out.
	      Specify 0 as extension number to get a print of the main header plus all extension headers.

       Examples :
       dfits *.fits
       dfits *.fits | grep NAXIS3
       gzip -d < star.fits.gz | dfits - | more
       dfits -x 0 *.fits
       dfits -x 3 *.fits

SEE ALSO

       fitsort can be combined with dfits output to sort out keyword values of a group of FITS files.

FILES

       Files shall all comply with FITS format

								    30 Mar 2000 							  dfits(1)