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Top Forums UNIX for Dummies Questions & Answers Basic number checking problem Post 302354949 by ChrisHoogie on Monday 21st of September 2009 04:19:29 AM
Old 09-21-2009
Basic number checking problem

Hello all

I am having problems using a bash script to read the input from the user and checking that its a valid number. I only want the user to input a maximum of a 3 number string (321 , 521 , 871 etc.). Anything longer or that includes a chararcter or symbol will display an error message.

heres what i have got so far

Code:
 
read input
 
        for ((x=1;x<4;x++)){
        v=`echo $input | cut -c $x`
        if [ $v !-eq (0-9) ]
        then
        echo "error"
        else
        continue
        fi
        }

 

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funnel(1)							     logtools								 funnel(1)

NAME
funnel - split one pipe stream to one or more files or programs SYNOPSIS
funnel [|] [>[>]file] [|process] DESCRIPTION
The funnel program will read data from standard input and write it to several output streams. The | symbol means to copy standard input to standard output. The > symbol means that a file name immediately follows with no separating spaces, the file will be truncated if it exists or created if it doesn't. The >> means that the file is to be appended to if it exists. A | symbol followed immediately by text indicates a command that is to be run by system() and will have all input piped to it. EXIT STATUS
0 No errors 1 Error opening input Other errors are 100 + number of commands or files that fail AUTHOR
This program, its manual page, and the Debian package were written by Russell Coker <russell@coker.com.au>. FEATURES
Uses popen (3) for output so that shell expansion gets performed. If you want such shell expansion then you must ensure that you quote the parameters correctly so that they get expanded by popen (3) not the shell that calls funnel. SEE ALSO
popen(3) Russell Coker <;russell@coker.com.au> 0.06 funnel(1)
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