display echo only once Post: 302630415

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Top Forums Shell Programming and Scripting display echo only once Post 302630415 by subway69 on Wednesday 25th of April 2012 08:04:26 PM

04-25-2012

Registered User

Quote:

Originally Posted by agama

Do you have it in a loop? Sounds to me like something other than the echo is your problem.

It would be helpful to see your script along with the shell that you are using and O/S.

sure thing it is a for loop

Code:

#!/bin/bash

for img in *.jpg
do
        if [ $# -gt 0 ]
then
        jpegtopnm "$img" | pnmscale -height 200 | pnmtojpeg > "${img%.jpg}-thumb.jpg"
        echo $img
else
        echo -n  "Please provide a proper image file"
fi
shift
done

what its doing is taking any file ending in .jpg in the current directory and making it into a thumbnail. I am running into a problem where I want it to display the error message only if no arguments are provided on the command line. I am not doing it right Smilie

Its my fault for trying to make it convert everything in the directory ending in .jpg using the FOR loop but I'm at the same time trying to feed an argument on the command line . . I am in a pickle... I would much rather just feed it command line but at the same time have it being able to take 1 argument or even a list but still give an error if no arguments are being displayed. Im new to this sorry. Any help is appreciated.

subway69

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LEARN ABOUT SUSE

img-window

img-window(n)															     img-window(n)

NAME

       img-window - Img, Tk Windows (window)

SYNOPSIS

       package require Tk

       package require img::window  ?1.3?

       image create photo ?name? ?options?

DESCRIPTION

       The package img::window is a sub-package of Img. It can be loaded as a part of the complete Img support, via package require Img, or on its
       own, via package require img::window.

       Like all packages of Img it does not provide new commands, but extends the  existing  Tk  command  image.   More  specifically  img::window
       extends Tk's photo image type.

       The name of the new format handler is window.

       This  handler  does not provide additional configuration options.  This handler is special. Instead of reading or writing image data from a
       file or string it allows the embedding of a Tk widget into the photo image. In other words, it takes a snapshot of the  contents  of  a	Tk
       window.

       All of the above means that in a call like

       image create photo ?name? ?options?

       [1]    Image  data  in  window  format (option -data) is detected automatically. Image data is considered to be in the window format if the
	      value given to option -data is the name of an existing Tk window.

	      Note that the standard option -file is not supported by this handler.

       [2]    The format name window is recognized by the option -format.

SEE ALSO

       img-bmp, img-gif, img-ico, img-intro, img-jpeg, img-pcx, img-pixmap, img-png, img-ppm, img-ps, img-sgi, img-sun,  img-tga,  img-tiff,  img-
       window, img-xbm, img-xpm

KEYWORDS

       image handling, tk, window

COPYRIGHT

       Copyright (c) 1995-2003 Jan Nijtmans <nijtmans@users.sourceforge.com>

Img									1.3							     img-window(n)