BASH - last charachter of an variable

Hello,
How can i see the last charachter of an variable ?
lets say:
var=123456.
and i want to echo just the '.'
rares_dumitrescuAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

rares_dumitrescuAuthor Commented:
or, how can i check if an variable looks like an ip? (like this: xxx.xxx.xxx.xxx)
Where xxx are digits, and they can be 1 2 or 3 digits between the '.'
0
MikeOM_DBACommented:

You can convert to array and then check each portion:

#!/bin/bash
var='12.345.678.1'
IFS='.'
arr=($var)
echo "${arr[0]} ${arr[1]} ${arr[2]} ${arr[3]}"arr=(`echo $var|tr '.' ' ')
--or--
#!/bin/bash
var='12.345.678.1'
arr=(`echo $var|tr '.' ' '`)
echo "${arr[0]} ${arr[1]} ${arr[2]} ${arr[3]
0
MikeOM_DBACommented:
Ooops, typo:

#!/bin/bash
var='12.345.678.1'
IFS='.'
arr=($var)
echo "${arr[0]} ${arr[1]} ${arr[2]} ${arr[3]}"
--or--
#!/bin/bash
var='12.345.678.1'
arr=(`echo $var|tr '.' ' '`)
echo "${arr[0]} ${arr[1]} ${arr[2]} ${arr[3]
0
Microsoft Azure 2017

Azure has a changed a lot since it was originally introduce by adding new services and features. Do you know everything you need to about Azure? This course will teach you about the Azure App Service, monitoring and application insights, DevOps, and Team Services.

rares_dumitrescuAuthor Commented:
and how could i include it in a while, something like:

while -the variable is not xxx.xxx.xxx.xxx (xxx can be max 255)-
do ask for a new variable
0
rares_dumitrescuAuthor Commented:
anyone ?
0
amit_gCommented:
You could use something like this...

var="123.45.6.7"
if echo "$var" | egrep -e '^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$'
then
    IFS='.'
    arr=($var)
    if [ ${arr[0]} -le 255 -a ${arr[1]} -le 255 -a ${arr[2]}  -le 255 -a ${arr[3]} -le 255 ]
    then
        echo "IP"
    else
        echo "Non-IP"
    fi
else
    echo "Non-IP"
fi
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
System Programming

From novice to tech pro — start learning today.