How to validate input parameters? Post: 302409986

Sponsored Content

Top Forums Shell Programming and Scripting How to validate input parameters? Post 302409986 by bakunin on Saturday 3rd of April 2010 02:09:22 PM

04-03-2010

Registered User

This is a very good question! I have a ksh function dealing with exactly this im my library.

Lets start with an integer: an integer is a sequence of digits 0-9 preceeded optionally with a plus or a minus sign:

Code:

# i assume the string in question was passed as argument $1 here
if [ -n "$(print - $1 | sed 's/[+-]*[0-9][0-9]*//')" ] ; then
     print - "string is not an integer"
else
     print - "string is an integer"
fi

The sed statement will delete out a possible integer and if the remaining string still contains characters ("-n") it can't be an integer. This mechanism is the core of my f_CheckInteger() function.

General numerics are a bit more complicated. I didn't bother to implement localized decimal separators (americans write "123.4", germans write "123,4", etc.) or something such, so i ended with the quite simple definition:

A numerical value is a string consisting of an optional plus/minus sign, followed by one or more digits 0-9, optionally followed by a full stop "." followed by one or more digits 0-9.

These are valid numbers according to this definition: 0.123 123 123.0, -123.4
These are not valid numbers: 0..123 0.123.456 123. +-12

Code:

# i assume the string in question was passed as argument $1 here
if [ -n "$(print - $1 | sed 's/[+-]*[0-9][0-9]*\(\.[0-9][0-9]*\)*//')" ] ; then
     print - "string is not a numeric"
else
     print - "string is a numeric"
fi

I hope this helps.

bakunin

bakunin

View Public Profile for bakunin

Find all posts by bakunin

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How to validate input values

Hi How would i validate value of a variable whether it is number,date or string Thanks in advance Sas

2. Shell Programming and Scripting

Need to validate a date input format

Hi all, I have a shell script(K shell) which takes a date as input. i want the input to be in DD-MM-YYYY format. Can i enforce such a format of input string using just one line of code? OR do i need to parse the input date into different components and test them using Case statements...

3. Shell Programming and Scripting

validate input

the user inputs names that have to be inside square brackets I want to check if the user puts the brackets and if not ask him to re-enter the names

4. UNIX for Dummies Questions & Answers

BASH validate user input

Hey, im trying to validate a user input and need some help. The input needs to be just a single letter. Im using a case to so this eg: read answer case $answer in *) echo "OK" ;; *) echo "This is a number" read answer ;; *) echo...

5. Shell Programming and Scripting

Validate and sort input

Hi, This will most likely be a simple answer. Currently I have a situation where my script will be sent various options: -o1 -o2 -oe3@somthing.com Now, if I want to run a certain command based on the option I am sent, I am doing the following. for o in $(echo $options) do if ...

6. Shell Programming and Scripting

Another validate input Question.

I'm writing a bash shell script to 'help' me post to susepaste (I can NEVER remember the time options). Here's the code: #!/bin/bash ########## # # Project : personal script. # Started : Wed Aug 03, 2011 # Author : Habitual # Description : susepaste c-li script with user...

7. Shell Programming and Scripting

Epic - Validate input size

Is there an easy way to validate an input field size. Let us say a script is asking to enter 10 digits mobile number, how do I write a script to validate it is numeric and is 10 digits in length? I just need an easy way w/o using looks ...etc. Is there such a away ? Here is what I have so far...

8. Shell Programming and Scripting

How to validate user's input..?

$Input_filename=$ARGV; if (!-d $Input_filename && ! -e $Input_filename) { print "USAGE: Please enter '$ABCD/def/dsed.txt' as an arguement \n"; exit; } 1. Input Is suppose to be something like "$ABCD/def/dsed.txt". if the input is wrong the script should throw an ERROR message....

9. Shell Programming and Scripting

Validate input files and update

We have a job which we need to run on daily bases, before loading data in a table we need to validate whether the input file is received or not.Inputfile formatsrc_sps_d_Call_Center_Reporting_yyyymmdd_01.dat SPS-Service nameYYYY-yearMM-MonthDD-dayLike above we will get n number of files for...

10. Shell Programming and Scripting

Validate input files daily

We have a job which we need to run on daily bases, before loading data in a table we need to validate whether the input file is received or not. Daily client will place the files in a particular path.Below files which I need to process for 04/01/2013(Load date)....

LEARN ABOUT DEBIAN

apertium-validate-acx

apertium-validate-acx(1)												  apertium-validate-acx(1)

NAME

       apertium-validate-acx - This application is part of ( apertium )

       This tool is part of the apertium open-source machine translation toolbox: http://www.apertium.org.

SYNOPSIS

       apertium-validate-acx <input_file>

DESCRIPTION

       This is an intermediate tool from Apertium level 2 engine. You should never have to use it independently.

       It is a script that validates a set of structural acx rules against the apertium structural acx rules RNG using the xmllint utility.

OPTIONS

       It has no options.

FILES

       input_file A acx.xml file

       acx.rng The DTD used to validate the input file.

SEE ALSO

       apertium-gen-modes(1),  apertium-gen-oldbil(1),	apertium-interchunk(1), apertium-validate-modes(1), apertium-validate-interchunk(1), aper-
       tium-validate-postchunk(1).

BUGS

       Lots of them...lurking in the dark and waiting for you!

AUTHOR

       Copyright (c) 2005-2007 Universitat d'Alacant / Universidad de Alicante.  This is free software.  You may redistribute copies of  it  under
       the terms of the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.

								    2006-03-11						  apertium-validate-acx(1)