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Error in for loop

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# 8  
Old 05-01-2014
There is no constant relationship between the pairs of numbers. In some situations I will have 3 or 4 numbers as arguments. So basically, I might not need a for loop.

Can I have all the pairs of numbers in a text file and call it into the executable of the perl script?

for example the text file

Code:
1 1 2
10 10 12
...
....

Not sure how to implement that. May be using xargs
# 9  
Old 05-01-2014
Well, we can try a few suggestions:-
Code:
$ cat ref_file
1 2
2 4
3 7
4 10
10 12
$ for i in 1 10
do
   echo perl $i `grep "^$i " ref_file`
done

Code:
#!/bin/ksh
set -A i 1 2 3 4 10                  # Define 1st range
set -A j 2 4 7 10 120                # Define 2nd range

if [ ${#i[*]} -ne ${#j[*]} ]
then
   echo "Reference count mismatch"
   exit
fi

for ref in 1 10
do
   echo perl ${i[$ref]} ${i[$ref]} ${j[$ref]}
done

There are bound to be loads of other options. What would best for you?



Robin
# 10  
Old 05-01-2014
Quote:
Originally Posted by rbatte1
Well, we can try a few suggestions:-
Code:
$ cat ref_file
1 2
2 4
3 7
4 10
10 12
$ for i in 1 10
do
   echo perl $i `grep "^$i " ref_file`
done

Don't let the OP's use of a for-loop restrict your thinking. A simple while read x y; do ... would be a much more robust approach.

Regards,
Alister
# 11  
Old 05-01-2014
I am a fool Smilie

Yes this would be neater with the a suitable input file:-
Code:
while read i j
do
   echo perl $i $i $j
done < ref_file


Thanks Alister Smilie



Robin
Last edited by rbatte1; 05-01-2014 at 10:59 AM..
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