Using awk with column number in a bash script

Question

I'm using a command like this to get some connections from nf_conntrack:

awk '($3 == "tcp") && ($6 != "TIME_WAIT") && ($10 == "dport=1234")' /proc/net/nf_conntrack 

How to use this command inside of a bash script and also add a script argument to it? If I just do:

awk '($3 == "tcp") && ($6 != "TIME_WAIT") && ($10 == "dport=$1")' /proc/net/nf_conntrack 

It will suppose all $1,$3,$6,... are script arguments and fail. How do I separate awk column numbers from the script arguments to use this command properly?

Answer 1

It is not necessary, but it is the rule of thumb to explicitly declare variables you want to pass from your env to awk

awk -v myvar="dport=$1" '($3 == "tcp") && ($6 != "TIME_WAIT") && ($10 == myvar)' /proc/net/nf_conntrack