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#!/bin/bash
VARIABLE=$1
awk '{print first line}' $VARIABLE > Intermediate.ter
awk '{print second line}' $VARIABLE > Intermediate_2.ter
command Intermediate.ter Intermediate_2.ter > Output.out
...

while grep -q NaN Output3.out
do
command
done


---------- Post updated at 09:33 AM ---------- Previous update was at 09:31 AM ----------

that's asking for an infinite loop though....

You can specify the number of places after the decimal point, but not the number of digits in general.

What I'd do is print it to more decimal places than you need into a variable, then substr()...

awk 'NR < 5{a[NR%5]=$0; next}{print $0 + a[NR%5+1]}' file


Use nawk or /usr/xpg4/bin/awk on Solaris if you get errors.

You could do something like:
awk '{ lines[NR]=$0 } END { print lines[1]+lines[5] }' filename

I think this may do close to what you want:

# hydrogen.awk

FNR == 1 { FILECOUNT++ }

# Load master data table into memory
NR == FNR { for(N=1; N<=NF; N++)
{
...