dating service telephone numbers - Validating user input in unix

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/bin/bash# SCRIPT: validinteger.sh# USAGE: [ Input value to be validated ]# PURPOSE: validate integer input, allow negative integers also## \\\\ ////# \\ - - //# @ @# ---o OOo-( )-o OOo---## Using the $?exit status variable or integer comparison operators, a# script may test if a parameter contains only digits, so it can be# treated as an integer.####################################################################### Arguments Checking ######################################################################if [ $# -eq 0 ]then echo -n "Enter input to test: " read Numberelse Number=$1fi# You can also use bellow one liner#[ $# -eq 0 ] && || Number=$1###################################################################### Main Script Starts Here ####################################################################### Check the input is an integer or notif [ $Number -ne 0 -o $Number -eq 0 2# chmod 755 validinteger.sh# ./-12345Supplied Input -12345 is an Integer# ./12345ASupplied Input 12345A is not an Integer.# ./Enter input to test: 876549Supplied Input 876549 is an Integer# ./Enter input to test: -345k123Supplied Input -345k123 is not an Integer.#!/bin/bash# SCRIPT: validinteger2.sh# USAGE: validinteger2[ Input value to be validated ]# PURPOSE: validate integer input, allow negative integers also### \\\\ ////# \\ - - //# @ @# ---o OOo-( )-o OOo---## In this method if you want to allow negative integers, it gets a# tiny bit more complicated.

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/bin/bash# SCRIPT: validinteger.sh# USAGE: [ Input value to be validated ]# PURPOSE: validate integer input, allow negative integers also## \\\\ ////# \\ - - //# @ @# ---o OOo-( )-o OOo---## Using the $?

###################################################################### Main Script Starts Here ####################################################################### Check the input is an integer or notif [ $Number -ne 0 -o $Number -eq 0 2# chmod 755 validinteger.sh# ./-12345Supplied Input -12345 is an Integer# ./12345ASupplied Input 12345A is not an Integer.# ./Enter input to test: 876549Supplied Input 876549 is an Integer# ./Enter input to test: -345k123Supplied Input -345k123 is not an Integer.#!/bin/bash# SCRIPT: validinteger2.sh# USAGE: validinteger2[ Input value to be validated ]# PURPOSE: validate integer input, allow negative integers also### \\ ////# \ - - //# @ @# ---o OOo-( )-o OOo---## In this method if you want to allow negative integers, it gets a# tiny bit more complicated.

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I've recently written about using bash arrays and bash regular expressions, so here's a more useful example of using them to test IP addresses for validity.

To belabor the obvious: IP addresses are 32 bit values written as four numbers (the individual bytes of the IP address) separated by dots (periods).

This method treats input as a string then parses and tests it for proper formatting.

In this form, I have it also checking if the fields in the date are correct, but you can remove those conditionals if you don't need them.

" answer # (2) handle the command line argument we were given while true do case $answer in [y Y]* ) /usr/bin/wget -O - -q -t 1 "Okay, just ran the cron script." break;; [n N]* ) exit;; * ) echo "Dude, just enter Y or N, please."; break ;; esac done while true do # (1) prompt user, and read command line argument read -p "Run the cron script now?

Last modified 09-Jan-2020 06:31