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

Question

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

I have edit the question you can read it their.

Aleena
– Aleena

2016-08-11 08:03:00 +00:00
Commented Aug 11, 2016 at 8:03 — Aleena
– Aleena, Commented Aug 11, 2016 at 8:03

svante · Accepted Answer · 2016-08-11 11:34:46Z

1

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.

edited Aug 11, 2016 at 11:34

answered Aug 11, 2016 at 9:11

svante

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6 Comments

Aleena Over a year ago

I tried this but getting this error ./script.sh: 5: ./script.sh: Bad substitution

Aleena Over a year ago

It worked just changed #!/bin/sh to #!/bin/bash Thanks you so much.

svante Over a year ago

Great solution #!/bin/bash. Will add to answer.

Aleena Over a year ago

But in log level I don not want whole word in lower case. First word should be capital e.g Info, Debug

svante Over a year ago

Oh man, that is new information. If you change ${err,,} to ${err^} you will get what you want (providing you call script with lower case error levels).

|

Igor Chubin · Accepted Answer · 2016-08-11 08:07:02Z

1

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.

answered Aug 11, 2016 at 8:07

Igor Chubin

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3 Comments

Aleena Over a year ago

I want is that user can change whatever kind of logs he wants either error,debug,info or warn but just banging my head could not find anyway.

Igor Chubin Over a year ago

@MaheenNasir: Ok, then just do like I wrote

Aleena Over a year ago

Thanks. @Igor Chubin

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