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how to display an error if input value is not an IP address??

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# 1  
Old 03-21-2010
Question how to display an error if input value is not an IP address??
Dears,

I need your assistance, I'm creating a shell script to read the IP address of a server and i would like to display an error message in red if the entered value is not an IP. any ideas how can i do it?Smilie

#!/bin/sh

echo "Please enter the server IP address: \c"
read IPadd
????????????????????????????
????????????????

Similarly if i have the date in format yyyymmdd and i need to convert it to yymmdd, how can i do it? and how to display error message if the entered date is not in the correct (requested) format yyyymmdd??

Thanks in advance
# 2  
Old 03-21-2010
if ipv4, it does 3 points (.) for define an IP...

Code:
var=$(echo $IPadd | awk -F"." '{print $4}')
if [ -z $var ];then echo "Enter a correct format";fi

# 3  
Old 03-21-2010
Quote:
Originally Posted by Dendany83
Dears,

I need your assistance, I'm creating a shell script to read the IP address of a server and i would like to display an error message in red if the entered value is not an IP. any ideas how can i do it?Smilie

Please put code inside [code] tags.
Quote:
Code:
#!/bin/sh

echo "Please enter the server IP address: \c"
read IPadd
????????????????????????????
????????????????


Code:
is_validip()
{
	case "$*" in
	""|*[!0-9.]*|*[!0-9]) return 1 ;;
	esac

	local IFS=.  ## Bash only
	set -- $*

        [ $# -eq 4 ] &&
	    [ ${1:-666} -le 255 ] && [ ${2:-666} -le 255 ] &&
	    [ ${3:-666} -le 255 ] && [ ${4:-666} -le 254 ]
}

printf "%s: " "Please enter the server IP address"
read IPadd

if ! is_validip "$IPadd"
then
  printf "\e[31m%s\e[0m\n" "$IPadd"  ## Assumes a standard terminal
fi

Quote:

Similarly if i have the date in format yyyymmdd and i need to convert it to yymmdd, how can i do it? and how to display error message if the entered date is not in the correct (requested) format yyyymmdd??

Code:
printf "%s: " "Enter date in YYYYMMDD format"
read date

case $date in
  [0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]) ;;
  *) printf "%s\n" "Invalid date"; exit 1 ;;
esac

shortdate=${date#??}

You might also want to check that the values are in the correct range.
# 4  
Old 03-21-2010
if you have GNU date you can simply check the retrun code :
Code:
read -p "Enter date (YYYYMMDD) " DTE
if DTE=$(date -d "$DTE" +%y%m%d)
then echo "date is $DTE"
else echo "$DTE is an invalid date" # but date command will write its error on output
fi

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