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Full Discussion: Help Running a Check in Bash Script
Top Forums UNIX for Dummies Questions & Answers Help Running a Check in Bash Script Post 302510428 by Duo11 on Sunday 3rd of April 2011 11:51:12 PM
Old 04-04-2011
Question Help Running a Check in Bash Script
Hey guys, so I wrote a small script that pretty much just takes in two numbers and counts from the first to the second, e.g.
Code:
unknown-hacker|544> count.sh 1 3
1
2
3

My problem is I want to make it so that if you input invalid parameters, such as non-numerical characters, more than 2 numbers, etc., you'd get an error message. Any suggestions? Thanks in advance.

Edit: Here's what my script looks like so far:
Code:
#!/bin/bash

declare -i INDEX
declare -i RESULTS
if [ $1 -gt $2 ]; then
    INDEX=$1
    while [[ $INDEX -gt $2 ]] || [[ $INDEX -eq $2 ]]; do
        echo $INDEX
        INDEX=$INDEX-1
    done
elif [ $1 -le $2 ]; then
    INDEX=$1
    while [[ $INDEX -le $2 ]] || [[ $INDEX -eq $2 ]]; do
        echo $INDEX
        INDEX=$INDEX+1
    done
else
    echo $1

Last edited by Scott; 04-04-2011 at 02:37 AM.. Reason: Code tags, please...
 

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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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