CODEWITHSUNDEEP
bashshell
Aleena
Aleena

Reputation: 59

How to do a change in string of file using shell script

I have a config file xyz.conf which contains some fields and I want to do little change in between it according to the requirement of user. (i.e ERROR,INFO,DEBUG,WARN) How can I do that using shell script?

Example I have following lines

match => ["log_EventType", "ERROR"]
add_tag => [ "loglevelError" ]
if "loglevelError" in [tags] {

I want to changes these lines in 

match => ["log_EventType", "DEBUG"]
add_tag => [ "loglevelDebug" ]
if "loglevelDebug" in [tags] {

What i have tried so far is: match => ["log_EventType", "INFO"]

For this line I created a script

file=xyz.conf
err=$1
sed -i 's/"ERROR.*/"'$err'/' $file

and simply I run command ./script.sh INFO

But in Output I get 

match => ["log_EventType", "INFO

It does not return closing bracket after the word INFO

Upvotes: 1

Views: 96

Answers (2)

svante
svante

Reputation: 1385

This script solves your problem letting users specify any error level and have it replaced throughout the conf file regardless of which error level that was in the file in the first place:

#!/bin/bash
file="xyz.conf"
err="${1,,}"
sed -i 's/\(match => \["log_EventType", "\)[^"]*/\1'${err^^}'/g; s/\("loglevel\)[^"]*/\1'${err^}'/g' $file

Examples:

$ ./script.sh error
$ ./script.sh debug

Note: ${1,,}, ${err^^} and ${err^} will take care of upper/lower case but might not work for bash versions before 4.

Upvotes: 1

Igor Chubin
Igor Chubin

Reputation: 64563

Obviously, it is simply:

sed -i 's/ERROR/DEBUG/; s/loglevelerror/logleveldebug/' filename

It does not return closing bracket after the word INFO in your case, because you change not ERROR, but ERROR.*. It means that you want to substistute the whole line after the word ERROR and not only this word.

But I think that you want to handle some additional checks/conditions, that you didn't mention here. Please do it so we can improve our answers.

Upvotes: 1

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