CODEWITHSUNDEEP
variablesawk
Itai Ganot
Itai Ganot

Reputation: 6333

How to use variables in this awk command?

I'm trying to use the following command:

awk '/dev-api2\.company-private/{p=NR} p && NR==p+2 && /^HostName/{
$0="HostName 1.1.1.1"; p=0} 1' ~/.ssh/config > $$.tmp && mv $$.tmp ~/.ssh/config

Taken from this SO question.

Now I would like to replace the following:

dev-api2 with $shn
1.1.1.1 with $privateip

But now when I run the awk command it does nothing.

These are the values of the variables:

shn=dev-api2
privateip=3.3.3.3

Upvotes: 0

Views: 29

Answers (2)

Tom Fenech
Tom Fenech

Reputation: 74705

You will need to use a dynamic regex instead of a literal one:

awk -v shn="$shn" -v privateip="$privateip" '
    $0 ~ shn "\\.company-private" { p = NR } 
    p && NR == p + 2 && /^HostName/ { $0 = "HostName " privateip; p = 0 } 1'

Instead of /regex/, use $0 ~ "string". The string will be evaluated and transformed into a regex, so you need to double-escape \\.

Upvotes: 2

Vasyl Moskalov
Vasyl Moskalov

Reputation: 4650

Use \":

awk "/dev-api2\.company-private/{p=NR} p && NR==p+2 && /^HostName/{
$0=\"HostName 1.1.1.1\"; p=0} 1" ~/.ssh/config > $$.tmp && mv $$.tmp
~/.ssh/config

Upvotes: -1

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