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Full Discussion: Check for valid hostnames
Top Forums Shell Programming and Scripting Check for valid hostnames Post 302974687 by rahul2662 on Thursday 2nd of June 2016 06:26:27 AM
Old 06-02-2016
Hello Ravinder,

Below conditions should be satisfied for a valid hostname :

1) Maximum 3 dots ( can have zero dots as well)
2) maximum 63 characters within each dot

for example below should be a valid hostname

]$ksh hostnamecheck.ksh
Please enter the name:
newhost
Please enter correct name as it is matching the standards.

Thanks
Rahul
 

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LEARN ABOUT V7

let

let(1)                                                             User Commands                                                            let(1)

NAME

       let - shell built-in function to evaluate one or more arithmetic expressions

SYNOPSIS

   ksh
       let arg...

DESCRIPTION

   ksh
       Each arg is a separate "arithmetic expression" to be evaluated.

EXIT STATUS

       The following exit values are returned:

       0        The value of the last expression is non-zero.

       1        The value of the last expression is zero.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       ksh(1), set(1), typeset(1), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                             let(1)
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