get_val

#!/bin/bash
#Function to return the value of a specified parameter in an assignement
#statement
#Assumes value is numeric
#Get value of variable from line in file matching NAME = VAL !may have comment 
function get_val(){
    #VNAME if the variable name to find
    #FNAME is the file to search
    #INSTANCE is the number of the instance to show, defaults to 1
    
    #Set locals based on args
    local  VNAME=${1}
    local  FNAME=${2}
    local  INSTANCE=${3:-1}

    #Find value from file
    #Matches pattern | Gets bit after = | Gets bit before ! | removes blanks | prints INSTANCE match.
    local VAL=$(grep -i -E "^ *""${VNAME}"" *= *" ${FNAME} | awk -F'=' '{print $2}' | awk -F'!' '{print $1}' | sed 's/[ \t\n]*//g' | head -n ${INSTANCE} | tail -n 1)

    #If string is numeric then use calc to do formatting, should probably just
    #echo the value and allow the user to decide about formatting.
    if [ `echo ${VAL} | grep -v -E "^[0-9.eEdD+-]+$" | wc -l` -eq 0 ]
    then
	calc 1*${VAL}
    else
	echo ${VAL}
    fi
}