Edit a config file using shell script

Shell Programming and Scripting
1

I need to edit a config file using shell script. i.e., Search with the 'key' string and edit the 'value'.

For eg: below is what I have in the config file "configfile.cfg".

Key1=OldValue1
Key2=OldValue2

I want to search for "Key1" and change "OldValue1" to "NewValue1"

Thanks for your help.

2

If you want to replace one key in one file you can do it with vi or is this homework?

Regards

3

I want to do it in around 100 files - using shell script or a command. Not manually.

4

hope this hepls you

sed -e 's/\(key1\=\)\(Old\)\(value1\)/\1New\2/g' filename

please iterate this in you shell programs for the key1 values and old value for each file.

5

Edit: had that tab open for a while - chappidi_pradee gave a better solution

6

Thanks pradee.

Will this work for the below cases?

#This is a comment. YesNoFlag = No means it will not print
YesNoFlag = No

And I need to change No to Yes

7

i think the script that i posted will not work for the example that you mentioend becasue there should not be any spaces between the equal to sign (=).

8

what about the 'Key' part? I think the 'No' in the key (YesNoFlag) also will get replaced right? And again it will not skip the comment lines, correct?