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Full Discussion: Valid input compared with input
Top Forums Shell Programming and Scripting Valid input compared with input Post 302437530 by durden_tyler on Thursday 15th of July 2010 09:52:24 AM
Old 07-15-2010
Quote:
Originally Posted by ckozler
...
In short, I want to validate a users input in comparison with what I dictate as valid options-- the current logic I have tried time and time again does not seem to work as expected because it is simply doing a not equal check which occasionally fails because it is still hitting a valid option BUT just because the two strings do not equal each other, it errors out. This is not what I want.
...

You have the @selections array. And you have the @valid_options array. What you want to do is - loop through @selections array, and use grep to check if the current element is present in @valid_options array. If it is, you have a valid option; otherwise not.

Code:
$
$
$ perl -le '@valid_options = qw(valid1 valid2); @selections = qw(valid1 valid2 valid3 valid4);
            for $i (@selections) {print "$i is ", grep(/$i/,@valid_options) ? "Valid!" : "Invalid!"}'
valid1 is Valid!
valid2 is Valid!
valid3 is Invalid!
valid4 is Invalid!
$
$

tyler_durden
This User Gave Thanks to durden_tyler For This Post:
ckozler
 

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LEARN ABOUT OPENSOLARIS

ppmtosixel

ppmtosixel(1)                                                 General Commands Manual                                                ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.  The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
              pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order  of  magni-
              tude larger than a compressed file and prints much slower.

       -margin
              If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
              fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater  than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

                                                                   26 April 1991                                                     ppmtosixel(1)
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