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Re: Compare 2 arrays.


From: Bill Gradwohl
Subject: Re: Compare 2 arrays.
Date: Tue, 29 May 2012 21:25:02 -0600

I have no idea what the wget's are supposed to be doing, but here's a
function that will compare 2 foreign arrays and return true 0 or false 1.

compareForeignArrays(){
   ## $1 and $2 are the names of the arrays to compare.
   ## These are characters strings.

   local intermediary
   local sub

   intermediary="address@hidden"
   local -a leftValue=("${!intermediary}")

   intermediary="address@hidden"
   local -a rightValue=("${!intermediary}")

   local -a leftSub
   eval leftSub=(\"address@hidden")

   local -a rightSub
   eval rightSub=(\"address@hidden")

   [ address@hidden -ne address@hidden ] || \
   [ address@hidden -ne address@hidden ] && return 1

   for ((sub=0; sub<address@hidden; ++sub)); do
      [ "${leftSub[sub]}" -ne "${rightSub[sub]}" ] && return 1
   done

   for ((sub=0; sub<address@hidden; ++sub)); do
      [ "${leftValue[sub]}" -ne "${rightValue[sub]}" ] && return 1
   done

   return 0
}

declare -a this=(1 2 3 4 5)
declare -a that=(1 2 3 4 5)
compareForeignArrays this that && echo Equal || echo NOT Equal

declare -a yours=(10 20 30 40)
declare -a mine=(10 21 30 40)
compareForeignArrays yours mine && echo Equal || echo NOT Equal

declare -a red=(1 2 3 4 5)
declare -a blue=(1 2 3 4)
compareForeignArrays red blue && echo Equal || echo NOT Equal

declare -a night=(1 2 [7]=3 4 5)
declare -a day=(1 2 [6]=3 4 5)
compareForeignArrays night day && echo Equal || echo NOT Equal



-- 
Bill Gradwohl


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