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03-10-2006
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Substitute variable values
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 
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03-10-2006
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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}]"
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03-10-2006
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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.
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03-13-2006
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Substitue variable value
Quote:
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
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