[ale] OT: Bash Question

[Asif]

The following works for me ( both for even,odd  and 0-numbered list in the list
file )

#!/bin/bash

file=$1
count=`wc -l $file | awk '{  printf "%i", $1/2 }'`
i=0;
for item in `cat $file`
do
        if [ $i -lt $count ]
        then
                i=`expr $i + 1`
                echo $i $item
        fi
done


Hope it helps.

Asif

Jeff Layton wrote:

> Sorry about the OT, but I didn't know where else to turn.
>
>    I'm writing a simple shell script that cats a file to a
> variable (the file is just a list). I want to loop over only
> HALF of that list. So I want something like this:
>
> NODES=$(cat node.txt)
>
> for i in ${NODES}/2
> do
>    echo ${i}
> done
>
> Of course, this doesn't work.
>    I've also tried "counting" the number of items in the
> list, dividing by 2, and using a while loop. The only thing
> is, I don't know how to access a particular element in
> the list,
>
> NODE_FILE="node.txt"
> NODES=$(cat node.txt)
>
> declare -i NP
> declare -i NP2
> NP=`wc -l $NODES | awk '{print $1}'`
> NP2=NP/2
>
> iloop=1
> while (( $iloop <= ${NP2} ))
> do
>     # Here I want to echo the "iloop" element of $NODES
>     let iloop+=1
> done
>
>    I really appreciate any help anyone can give. I'm also
> pretty tolerant of comments about my scripting capabilities :)
>
> Thanks!
>
> Jeff Layton
>
> ---
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