External variable in awk

Question

I have a script, in which a script snippet is:

x=3
awk \'$2=$x{print $1}\' infile

The external variable is x,

but it p

Answer 1

GAWK also supports the following syntax:

awk '$2 == x {print $1}' x=3 infile

An interesting usage is:

awk '$2 == x {print $1}' x=3 infile1 x=10 infile2

in this case x will be equal to 3 for infile1 and equal to 10 for infile2