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Full Discussion: Check for valid hostnames
Top Forums Shell Programming and Scripting Check for valid hostnames Post 302974698 by RudiC on Thursday 2nd of June 2016 11:01:36 AM
Old 06-02-2016
How about (pure recent bash):

Code:
read NAME
IFS="."; NARR=($NAME)
ST=1
for i in ${!NARR[@]}; do [ ${#NARR[$i]} -gt 63 ] && { ST=0; break; }; done
[ ${#NAME} -le 253 ] && [ ${#NARR[@]} -le 4 ] && [[ ! "$NAME" =~ [^[:alnum:].-] ]] && [ $ST -eq 1 ] && echo good || echo bad

 

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GEOIP_ID_BY_NAME(3)							 1						       GEOIP_ID_BY_NAME(3)

geoip_id_by_name - Get the Internet connection type

SYNOPSIS
int geoip_id_by_name (string $hostname) DESCRIPTION
The geoip_id_by_name(3) function will return the Internet connection type corresponding to a hostname or an IP address. The return value is numeric and can be compared to the following constants: o GEOIP_UNKNOWN_SPEED o GEOIP_DIALUP_SPEED o GEOIP_CABLEDSL_SPEED o GEOIP_CORPORATE_SPEED PARAMETERS
o $hostname - The hostname or IP address whose connection type is to be looked-up. RETURN VALUES
Returns the connection type. EXAMPLES
Example #1 A geoip_id_by_name(3) example This will output the connection type of the host example.com. <?php $netspeed = geoip_id_by_name('www.example.com'); echo 'The connection type is '; switch ($netspeed) { case GEOIP_DIALUP_SPEED: echo 'dial-up'; break; case GEOIP_CABLEDSL_SPEED: echo 'cable or DSL'; break; case GEOIP_CORPORATE_SPEED: echo 'corporate'; break; case GEOIP_UNKNOWN_SPEED: default: echo 'unknown'; } ?> The above example will output: The connection type is corporate PHP Documentation Group GEOIP_ID_BY_NAME(3)
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