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Increment nested for loop parllely

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# 1  
Old 09-01-2008
Data Increment nested for loop parllely
Hi ,

I am trying to increment the nested for loops parellely,but i cant ,i used continue 2 but the second loop not getting increment.

no1="1 6 5 4 8"
no2="4 7 8 0 1"
for var1 in $no1 ; do
for var2 in $no2 ; do
line1
line 2
line 3
continue 2
done
done

Please help on this
# 2  
Old 09-01-2008
Hi.

It is not clear what your goal is. In your construction, every time you enter the inner loop, the sequence will begin again -- that's the nature of the loop.

Here's how I would do this, but it is guessing what you are trying to accomplish:
Code:
#!/bin/bash -

# @(#) s2       Demonstrate array use for processing in parallel.

# See http://www.tldp.org/LDP/abs/html/arrays.html for details on
# arrays.

echo
echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version "=o" $(_eat $0 $1)
set -o nounset

echo
echo " Results:"

no1=( 1 6 5 4 8 )
no2=( 4 7 8 0 1 )
length=${#no1[*]}
echo " length is $length"

i=0
while (( i < length ))
do
  echo iteration $i no1[$i] = ${no1[$i]}, no2[$i] = ${no2[$i]}
  (( i++ ))
done

exit 0

Producing:
Code:
% ./s2

(Versions displayed with local utility "version")
Linux 2.6.11-x1
GNU bash 2.05b.0

 Results:
 length is 5
iteration 0 no1[0] = 1, no2[0] = 4
iteration 1 no1[1] = 6, no2[1] = 7
iteration 2 no1[2] = 5, no2[2] = 8
iteration 3 no1[3] = 4, no2[3] = 0
iteration 4 no1[4] = 8, no2[4] = 1

See Arrays ... cheers, drl
# 3  
Old 09-03-2008
Bug
Hi,

Thanks for this and sorry for not explaining my goal clearly.
This is what i tried to post and i got it exactly and its working fine.
Thanks again for this help.
# 4  
Old 09-03-2008
A construct which works even in Bourne Classic (tm) is to run the variables in parallel in a while loop, like this:

Code:
while read var1 var2; do
  : stuff
done <<HERE
1 4
6 7
5 8
4 0
8 1
HERE

# 5  
Old 09-03-2008
Bug
Thanks for this...
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