Question

a simple csh script

Asked by: guochu

I am looking for an example of csh script to test the input is a positive integer. Any input can help!!! Thanks!

My one didn't work
--------------------------
echo -n "Please enter a positive integer "
set input=$<
if ($input contains '-' || $input contains '.') then
    echo "wrong input"
else
   echo "input accepted"
endif
---------------------------
my problem is that I don't know how to grep the $input whether or not has a symbol minus sign i.e. '-' or decimal sign i.e. '.'

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Asked On
2008-09-29 at 11:56:54ID23772489
Topics

Scripting Languages

,

csh / tcsh

,

Shell Scripting

Participating Experts
1
Points
200
Comments
7

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Answers

 

by: ozoPosted on 2008-09-29 at 12:09:41ID: 22599543

if ( $input =~ *[.-]* ) then

 

by: guochuPosted on 2008-09-29 at 12:48:56ID: 22599959

it won't work if the input is abc :(

 

by: ozoPosted on 2008-09-29 at 13:41:09ID: 22600460

abc does not have a  minus sign i.e. '-' or decimal sign i.e. '.'
if you want o disallow anything other than digits, you might do
if ( $input =~ *[\!-/:-~]* ) then

 

by: guochuPosted on 2008-09-29 at 14:26:39ID: 22600874

Work like a charm!!! Thanks! Can you explain [\!-/:-~] a little bit please?

 

by: guochuPosted on 2008-09-29 at 18:27:56ID: 22602119

Hello ozo, please explain a little bit!

 

by: ozoPosted on 2008-09-29 at 18:32:24ID: 22602137

[^0-9] was failing in my csh when there was a * in front of it, so I used [\!-/:--~]  instead, which included the printable non-digits

20120131-EE-VQP-002

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