I am using the following command to output a list of servers with associated IPs. For another part of my script, I need this output to be formatted in a particular manner. With an incrementing line number above each line. Example below
paste <(aws ec2 describe-instances --query 'Reservations[*].Instances[*].Tags[*].{Name:Value}' --output text) \
<(aws ec2 describe-instances --query 'Reservations[*].Instances[*].{PrivateIP:PrivateIpAddress}' --output text) | awk 'ORS="\n\n"' >> $TMP1
Which outputs ( in a tmp file ) :
Dev Server 111.11.11.11
Test Server 222.22.22.22
However how can I append numbers to each blank line like so?
Example
1
Dev Server 111.11.11.11
2
Test Server 222.22.22.22
Use awk:
$ cat FILE
Dev Server 111.11.11.11
Test Server 222.22.22.22
$ awk '{ if ($0 ~ /^$/) { print ++counter } else { print $0 }}' FILE
1
Dev Server 111.11.11.11
2
Test Server 222.22.22.22
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