Command line user input validation Post: 302462825

Sponsored Content

Top Forums Shell Programming and Scripting Command line user input validation Post 302462825 by felipe.vinturin on Friday 15th of October 2010 06:30:58 AM

10-15-2010

Registered User

Check below, it may help you!

Code:

#!/bin/bash

isNumber ()
{
	# Validates if argument is a number or not
	# return/echo the argument if it is a number 
	# return -1 if it is not a number
	errRetCode="-1"
	
	var="${1}"
	
	# expr exit status:
	#	0 if the expression is neither null nor 0,
	#	1 if the expression is null or 0,
	#	2 if the expression is syntactically invalid,
	#	3 if an error occurred.
	var=`expr ${var} + 0 2>/dev/null`
	[ ${?} -gt 1 ] && var=${errRetCode}
	echo ${var}
	return ${var}
}

validateOpt ()
{
	# Validates a input value against a list of values
	# returns 0 if is a valid opt
	# returns 1 if it is a 
	inputOpt="${1}"
	allInputOpt="${2}"
	
	errRetCode="-1"
	
	nInputOpt=`isNumber "${inputOpt}"`
	if [ ${nInputOpt} -eq -1 ]
	then
		echo "ERROR: Invalid number: [${inputOpt}]."
		return ${errRetCode}
	fi
	
	for validOpt in ${allInputOpt}
	do
		if [ ${nInputOpt} -eq ${validOpt} ]
		then
			echo "INFO: Option is valid: [${inputOpt}]."
			return 0
		fi
	done
	
	echo "ERROR: Invalid option: [${inputOpt}]."
	return ${errRetCode}
}

# Some Tests

validateOpt "1" "1 2 4 5 10"
validateOpt "10" "1 2 4 5 10"
validateOpt "-1" "1 2 4 5 10"
validateOpt "a" "1 2 4 5 10"

validateOpt "1" "1 2 4 5 10"
if [ ${?} -ne 0 ]
then
	# Either user entered an invalid number or an invalid option
fi

Regards.

felipe.vinturin

View Public Profile for felipe.vinturin

Find all posts by felipe.vinturin

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Input validation ?

I am trying to validate user input, at the moment what i have is as below :- echo "\n\tPlease, enter package name to import: \c" read PACKAGE So far this works perfect , But if the user does not input any thing it stalls :( What I need is, If the user does not enter the name of the...

2. Shell Programming and Scripting

Command line inputs validation

Hi, I have a script called read.sh that takes a file as input. Now I want to make that script take the file as input with a -f option preceding the filename. How can I do this validation. How can I find whether the given option is -f or not inside the script. Thanks in advance

3. UNIX for Dummies Questions & Answers

How to read a line of text from user input?

Hiii I wanna a read a line of text from standard input. The user enter data like this way name phone_no month1_salary month2_salary that is user enter the name ,phone no and salary of 2 months in a single line by giving spaces. I wanna add the 3rd and 4th fields ...ie add both...

4. Shell Programming and Scripting

how to do validation the input requirement with if/else

Hello Everyone, I have the following script; ------------------------------------------------------------------ #!/bin/ksh set HSC=$1 set SEX=$2 set EXP='export ORACLE_SID=AFISDB' if ($#argv !=2); then echo Usage $0 HSC SEX else date > modify_gender_trace.txt $EXP echo...

5. Shell Programming and Scripting

Input validation of file

Hi, I'm trying to do input validation for a file. If the user fails to enter a file name, the script should prompt for the file name or exit. I'm using this script to integrate with a bigger script which does ftp of the files which are "read". #!/bin/ksh echo "enter a file name" if then...

6. UNIX for Dummies Questions & Answers

Delete a line containing a string from user input

I have code that accepts input from a user, and when the user hits enter it is supposed to delete that whole line from the file. echo "Which record? " read record sed '/$record/d' file However, it does not delete it. Any help?

7. Shell Programming and Scripting

How to take input from the user from the command line and execute commands basedon that?

Hi, I am using solaris 10 and bash shell.Script execution follows below.Initially it will check whether a directory exists or not if does not exist it will create it.(This I have completed) Second step:I have four users say user1,user2,user3,user4.Script should prompt for the user id and...

8. Windows & DOS: Issues & Discussions

Validation in user input in batch script

I need to insert the validation in my batch script.When user enter the value it should be numeric+minimum length should be 2 for e.g. 02,03 if he puts 1a,1A,2a3 t hen should print the message that it is wrong and print te message enter valid value. Echo RC is in format of 02 set /p...

9. Windows & DOS: Issues & Discussions

Put the numeric validation in user input when value is 5.1.2.3

Hi I need to put the validation in batch script when user will enter the build number it should be numeric.I can put the validation for numeric values but there is .(dot) in number so it would not take it as numeric. Is it possible we can store it in variable and remove the .(dot) from the...

10. UNIX for Dummies Questions & Answers

Input Email ID Validation

Hi Experts, I've a script where users will input the email id. I want to loop the script until the user enter proper email id. Its validating for all condition and error out if any wrong data, but for one condition alone its not erroring out. Capture_EmailID() { echo -e "Please Enter...

LEARN ABOUT REDHAT

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)