Shell Programming and Scripting

FYI : I am not any college student.

Just out of curiousity i wanted to know if there is option available in shell (to be paticular BASH Shell) that can be used directly to do the above specified thing.

Regards,
14341

Consider the following snippets.

Code:

for var in ${num[@]}
do
#do what ever u want
#here var points to num[0],num[1],..num[END] as #loop progresses 
#
#Note that you did't use any variable to point to
#to 0,1,2,...END
done

whereas

Code:

n=${#num}

for ((i=0;i<$n;i++)); do
  echo ":${num[$i]} :${words[$i]}:"
  #here we explicitly declared "$i" to point as index
done

What about this. [untested]

Code:

n=${#num}

for i in 0 .. $n
echo ":${num[$i]} :${words[$i]}:"
done

cheers,
Devaraj Takhellambam

I'm still not following what you want.

You need to access each element of an array so you need to reference the element number some how.

You are asking if you can access 2 arrays at the same time? Each case is showing you can in the same echo statement as array elements are just ${array[element]}

You just echo/change/assign the element of the array you want

Thank you for all the replies.

Right now I am using the following. (using count as index)

Code:

#!/bin/bash

declare -a num
declare -a words

num=(1 2 3 4 5 6 7)
words=(one two three four five six seven)

count=0
while [ $count -lt ${#num} ]
do
    echo ":${num[$count]}: :${words[$count]}:"
    ((count++))
done

This is working fine.

But i wanted to know the internal execution of shell
i.e if you give
for var in ${num[@]}
It fetches the value of "num[index]" to "var", where index is its internal implementation.
I just wanted to know if there any way to obtain that internal index (using any special keywords/symbols) so that i can directly use it to reference the values of other arrays. (That's why i mentioned arrays of same size)
Excuse me for my bad communication if you still don't understand my question.

Thanks,
14341