UNIX for Dummies Questions & Answers

Hello,

I have a file with 4 columns.

An arbitrary example is shown below:

a Tp 10 xyz
b Tq 8 abc
c Tp 99 pqr
d Tp 44 rst
e Tr 98 efg


Based on the values in col 2 and col 3, I will execute another program.

I have been running this:

for i in {10..100}
do
awk '(($2=="Tp")&&($3=="$i"))' inputFile >> PatternFile
done

However, the above code is only giving output corresponding to $2. What do I need to do differently to include $3 as well?

Thanks,
Guss

to pass variables:

Code:

awk -v myvar="hi there" ' {print $1, myvar} ' inputfile

the -v can also be -v="$var" where $var is a shell variable.

This should be sufficient and much faster:

Code:

awk '$2=="Tp" && $3 >= 10 && $3 <= 100' inputFile > PatternFile

Thanks for your input Franklin52. However, I need to pass it as a variable, since the program(s) I shall be executing subsequently on the input file will depend on the individual values I extract.

Thanks,
Guss.

GNU awk allows ENVIRON eg:

Code:

awk '{ print ENVIRON["HOME"]; }'

You can use variables like this:

Code:

awk -v var1="TP" -v var2="10" -v var3="100" '
$2==var1 && $3 >= var2 && $3 <= var3' inputFile > PatternFile