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bash-shell-network/all/modules/net-utils.mod

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#!/bin/bash
# usage:
# [[ $(host_reachable host.net) ]] && echo sure || echo nope
# or
# host_reachable &> /dev/null && echo sure || echo nope
# or
host_reachable () {
if [[ $(command -v nmap) ]] && [[ $2 ]]; then
[[ $(nmap $1 -PN -p $2 | grep open) ]] && echo yes && return 0 || return 1
fi
if [[ $(command -v nc) ]] && [[ $2 ]]; then
[[ $(nc -w 2 $1 $2) ]] && echo yes && return 0 || return 1
fi
if [[ $(command -v ping) ]]; then
ping -c1 -W1 $1 &> /dev/null && echo yes && return 0 || return 1
fi
return 2 # return 2 to indicate no method was available
}
valid_ip()
{
local ip=$1
local stat=1
local res
if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
OIFS=$IFS
IFS='.'
ip=($ip)
IFS=$OIFS
[[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \
&& ${ip[2]} -le 255 && ${ip[3]} -le 255 ]]
res=$([ $? == 0 ] && echo true || echo false)
else
res=false
fi
echo $res
}
get_domain() {
local domain
domain=$(echo $1 | awk -F\. '{print $(NF-1) FS $NF}')
echo "$domain"
}