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10.02.2008 at 01:18PM PDT, ID: 23783100
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7.6

csh shell script problem

Asked by alfredng1 in Scripting Languages, csh / tcsh, Shell Scripting

My script can handle all positive integer input, but crash when the input is a decimal, string, negative value etc. I thought the if statement should be able to test against all the printable characters except from 0 to 9. Then why I got the output if I enter -10? Lastly, I run this script on another machine and the OS is ubuntu 2.6.24-19-386. I got all the expected output. Weird eh!!  What can I do to fix this problem? Please show your working code. Thanks!

e.g. machine one
Thor:~> ./myScript
Please enter a positive integer 100
10% of 100 is 10
Thor:~> ./myScript
Please enter a positive integer -10
10% of -10 is -1
Thor:~> ./myScript
Please enter a positive integer 10.5
@: Badly formed number.
Thor:~> ./myScript
Please enter a positive integer abc
@: Expression Syntax.

e.g. machine two
% ./myScript
Please enter a positive integer 10
10% of 10 is 1
% ./myScript
Please enter a positive integer -10
Sorry positive integer only
% ./myScript
Please enter a positive integer 10.5
Sorry positive integer only
% ./myScript
Please enter a positive integer abc
Sorry positive integer only
%




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#!/bin/csh
echo -n "Please enter a positive integer "
set input=$<
if ( $input =~ *[\!-/:-~]* ) then
     echo Sorry positive integer only
else
     @ answer = (($input * 10) / 100)
     echo 10% of $input is $answer
endif
[+][-]10.03.2008 at 03:17AM PDT, ID: 22632435

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[+][-]10.03.2008 at 03:31AM PDT, ID: 22632496

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[+][-]10.03.2008 at 03:34AM PDT, ID: 22632513

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[+][-]10.03.2008 at 06:55AM PDT, ID: 22633921

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About this solution

Zones: Scripting Languages, csh / tcsh, Shell Scripting
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Solution Provided By: alfredng1
Participating Experts: 2
Solution Grade: A
 
 
 
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