CODEWITHSUNDEEP
sed
redleu
redleu

Reputation: 3

SED - Change a strings in the line, only if that line start with

I tried quite a lot of thing and did some search without finding a proper way to do this :

I would like to modify the Apache LogFormat definition on several servers (a lot). So : within httpd.conf, replace this:

   LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
   LogFormat "%h %l %u %t \"%r\" %>s %b" common
   LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %I %O" combinedio

with this:

   LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %T" combined
   LogFormat "%h %l %u %t \"%r\" %>s %b %T" common
   LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %I %O %T" combinedio

without modifying that :

    CustomLog "logs/access_log" common
    CustomLog "logs/access_log" combined

So : I'm looking to s\" com\ %T" com\g', but only for lines containing LogFormat

And I'm starving to do such a thing.

Upvotes: 0

Views: 193

Answers (1)

Raman Sailopal
Raman Sailopal

Reputation: 12877

You would be better served using a dedicated solution such as Ansible for this but using sed, you could do the following:

sed -i '/^LogFormat/s/" combined.*$/ %T&/' httpd.conf

Search for all lines starting with "LogFormat" and then substitute double quotes, space and "combined" for a space, "%T" and the pattern identified.

Upvotes: 1

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