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Shell Programming and Scripting
Check for valid hostnames
Post 302974685 by RavinderSingh13 on Thursday 2nd of June 2016 06:16:50 AM
06-02-2016
Moderator
Quote:
Hello Ravinder,
Thanks for your reply.
I am actually developing a script to configure hostname. The script which will ask the user for the hostname. It will check for all the conditions mentioned in my previous mail and validate if the user has entered hostname as per the correct naming convention. If the user has not adhered to the valid hostname convention then script will echo error else script will proceed and make changes specific to the hostname in the RedHat configuration files.
Thanks
Rahul
Thanks for your reply.
I am actually developing a script to configure hostname. The script which will ask the user for the hostname. It will check for all the conditions mentioned in my previous mail and validate if the user has entered hostname as per the correct naming convention. If the user has not adhered to the valid hostname convention then script will echo error else script will proceed and make changes specific to the hostname in the RedHat configuration files.Thanks
Rahul
Could you please try following and let me know if this helps and covers your conditions, though I haven't tested it.
Code:
echo "Please enter the name:"
read NAME
ONE=1
VALUE=`echo $NAME | awk -F"." '{if(length($0)<=63 && NF==3 && $0 !~ /\.$/ && $0 !~ /^[[:digit:]]/ && $0 !~ /^-/ && $0 !~ /-$/ && $0 !~ /[[:space:]]/ && $0 !~ /[[:punct:]]/ && $0 !~ /[[:cntrl:]]/){print 1}}'`
if [[ $VALUE == $ONE ]]
then
echo "You have entered correct name as " $NAME
else
echo "Please enter correct name as it is matching the standards."
fii- length should be 63 char long.
ii- 3 dots.
iii- NO trailing dot at last of variable.
iv- should not start with a digit and hyphen, should not end with hyphen too.
v- no other symbols, punctuations, white spaces.
Could you please more elaborate about following point.
Quote:
has a maximum of 253 ASCII characters.
R. Singh
Last edited by RavinderSingh13; 06-02-2016 at 07:48 AM..
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LEARN ABOUT OPENSOLARIS
check-hostname
check-hostname(1M) System Administration Commands check-hostname(1M) NAME
check-hostname - check if sendmail can determine the system's fully-qualified host name SYNOPSIS
/usr/sbin/check-hostname DESCRIPTION
The check-hostname script is a migration aid for sendmail(1M). This script tries to determine the local host's fully-qualified host name (FQHN) in a manner similar to sendmail(1M). If check-hostname is able to determine the FQHN of the local host, it reports success. Other- wise, check-hostname reports how to reconfigure the system so that the FQHN can be properly determined. FILES
/etc/hosts Host name database /etc/nsswitch.conf Name service switch configuration file /etc/resolv.conf Configuration file for name server routines ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWsndmu | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ SEE ALSO
domainname(1M), sendmail(1M), hosts(4), attributes(5) SunOS 5.11 8 Mar 2006 check-hostname(1M)