bash-shell-base/function/helpers

#!/bin/bash
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"
}

# must be json as a string, depends on jq
get_prop_value () {
  local value
  # echo in $1 get $2
  value=$(echo $1 | jq -r .$2)
  echo $value
}

mounted () {
[[ ! $1 ]] && echo no mount point to test && return 2
 mountpoint "$1" &> /dev/null && echo yes || return 1
}


is_array() {
    local variable_name=$1
    [[ "$(declare -p $variable_name 2>/dev/null)" =~ "declare -a" ]]
}