Validating user input in unix

I read the date into a variable $YMD and that's where I want to proceed if the date is the right format, otherwise I'd want to prompt the user again to re-enter the date in the right format.I wrote a bash script which takes numbers for calculation via user input.Though a valid regex, it matches something entirely different.[0-255] is a character class with three elements: the character range 0-2, the character 5 and the character 5 (again).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.Putting the value of the subject IP address inside parenthesis and assigning it to itself thereby turns it into an array where each dot separated number is assigned to an array slot.

" answer # (2) handle the input we were given 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.";; esac done I prefer the second approach, but I thought I'd share both of them here.

$ -ge 1 && $ -le 30 && unset get_num done echo This is a number withn a range : $ "Since regular expressions deal with text rather than with numbers, matching a number in a given range takes a little extra care.You can't just write [0-255] to match a number between 0 and 255./bin/bash# SCRIPT: validinteger3.sh# USAGE: validinteger3[ Input value to be validated ]# PURPOSE: validate integer input, allow negative integers also## \\\\ ////# \\ - - //# @ @# ---o OOo-( )-o OOo---## In this method input value validated using ASCII value range of# numbers (48 - 57).# Sample script provided by Bond, Thank you Bond.####################################################################### 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 first character is - ?# This is another method to extract substring using Substring Removal# method.

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