Shell Programming and Scripting

Hi,
I am trying to redefine the value of a variable based on another variable value. And I want to read in my variables from a enviroment file in the end -- at least I think so. But 1st here's what I want I need to get working:

var_1="11 10 9 8 7 6 5 4 3 2 1"
var_2=3
var_3=4

So I want var_4="1 2 5 6 7 8 9 10 11 12 13".

How do I extract var_2 & var_3 values from var_1 to create var_4?

Thanks,

John

Not very clear but awk can get you close:

print "11 10 9 8 7 6 5 4 3 2 1" | nawk '{gsub(/(3\ |4\ )/,"");print}'

A better version of the clumsy awk approach:

print "13 11 10 9 8 7 6 5 4 3 2 1" | nawk '{gsub(/ 3 /," ",$0);gsub(/ 4 /," ");print}'

Code:

#!/bin/ksh

var_1="11 10 9 8 7 6 5 4 3 2 1"
var_2=3
var_3=4

var_4=$(echo "$var_1" | nawk -v v2="${var_2}" -v v3="${var_3}" '
{
   for(i=NF;i;i--)
     if( $i == v2 || $i == v3 )
       continue
     else
       printf("%s%s", $i, (i!=1) ? OFS : "\n")
}
')

echo "var_4->[${var_4}]"

Thanks,
I could not get the 1st oneto work but the 2nd version worked minus using awk instead of nawk (nawk not in the system).

But you hardcoded 3 & 4 in the gsub's and I need to have them as variables. What is getting substituted will change with every line read from my input file.

I'm new to this level of scripts so I will trying to enter variables in the 2nd version and see what happens.

Thanks again -- have a good weekend.

The above works but my finished script needs to have a variable in the gsub where the '3' & '4' are. I want to get these values from a input file.

I tried things like below but I get Invalid pattern.

print "13 11 10 9 8 7 6 5 4 3 2 1" | nawk '{gsub(/$var_2/,," ",$0);gsub(/ var_3/," ");print}'

What does this code need to be? Thanks

nawk -v var_2=$var_2 -v var_3=$var_3 '{gsub...