Edit/Match a string n lines below some specific match in Bash?

Question

I have a complex problem. Below is the ndxconfig.ini file I want to Edit

# /etc/ndxconfig.ini will override this file
# if APP_ID is added in service propery, service discovery will be using marathon;
# HOST/PORT specified will override values retrieved from marathon

[MARATHON]
HOSTS = {{ ','.join(groups['marathon'])}}
PORT = 8080
PROTOCOL = http
SECRET = SGpQIcjK2P7RYnrdimhhhGg7i8MdmUqwvA2JlzbyujFS4mR8M88svI7RfNWt5rnKy4WHnAihEZmmIUb940bnlYmnu47HdUHE


[MYSQL]
; APP_ID = /neon/infra/mysql
HOST = {{keepalived_mysql_virtual_ip}}
PORT = 3306
SECRET = tIUFN1rjjDBdEXUsOJjPEtdieg8KhwTzierD48JsgDeYc84DD6Uy5a6kzHfKolq1MNS1DKwlSqxENk33UulJd9DPHPzYCxFm

I want to change specifically marathon protocol conf from http to https. Not other's protocol conf. I have to match PROTOCOL = http 3 lines below the [MARATHON] line. I researched and couldn't find any solution. There's only 1 line below sed solutions.

One idea stuck mine was somehow specially grep [MARATHON] and 3 lines below and tail 1 line. I don't know. How can fix this? Please Help.

@dash-o https://stackoverflow.com/questions/18620153/find-matching-text-and-replace-next-line — Adil Saju, Oct 28 '19 at 10:27

score 2 · Accepted Answer · answered Oct 28 '19 at 10:21

2

Solution found here

sed '/\[MARATHON\]/{N;N;N;s/http/https/;}' <file>

answered Oct 28 '19 at 10:21

Corentin Limier

4,946
1
13
24

1

I guess that works specifically on AIX sed. I've visited that page already. – Adil Saju Oct 28 '19 at 10:26
Did you try it ? Works with my GNU sed and MacOS sed too – Corentin Limier Oct 28 '19 at 10:28
On stackexchange, it just specifies that on AIX sed, you need to use separate lines but command works on other versions. – Corentin Limier Oct 28 '19 at 10:30

score 1 · Answer 2 · answered Oct 28 '19 at 11:24

1

If you have python available, you can use crudini:

crudini --set ndxconfig.ini MARATHON protocol https

answered Oct 28 '19 at 11:24

Thor

45,082
11
119
130

such awesome python is. ty – Adil Saju Oct 28 '19 at 17:11

Shawn · Answer 3 · 2019-10-31T14:02:19.687

This screams for ed, which treats the file as a whole, not processing it a line at a time like sed (And also doesn't depend on the availability of the non-posix -i extension to sed for in-place editing of files):

ed -s ndxconfig.ini <<'EOF'
/MARATHON/;/^$/ s/^PROTOCOL = http$/PROTOCOL = https/
w
EOF

This will replace the PROTOCOL line in the block that starts with a line matching MARATHON and ending with a blank line. The protocol entry can be the second, third, fourth, etc. line; doesn't matter. If the protocol is already https, it won't do anything (Except print a question mark)

Edit/Match a string n lines below some specific match in Bash?

3 Answers3

Linked