sed - How to replace right part of equal sign (=) on a line Post: 302881034

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Top Forums Shell Programming and Scripting sed - How to replace right part of equal sign (=) on a line Post 302881034 by jcdole on Thursday 26th of December 2013 01:57:45 PM

12-26-2013

Registered User

Quote:

Originally Posted by neutronscott

You could try this. Make sure the variables are sed-safe though..

Code:

sed "s;^[# ]*\(${PARAMETER} * = *\)\(.*\);# \1\2\n\1${PARAMETER_NEW_VALUE};" "${FILE_TO_EDIT}"

Should be great if you can explain the syntax for my learning.

Any way I will try this.

---------- Post updated at 19:57 ---------- Previous update was at 14:00 ----------

Quote:

Originally Posted by neutronscott

You could try this. Make sure the variables are sed-safe though..

Code:

sed "s;^[# ]*\(${PARAMETER} * = *\)\(.*\);# \1\2\n\1${PARAMETER_NEW_VALUE};" "${FILE_TO_EDIT}"

Small bug.

Parameters :

Code:

PARAMETER="fallback_node"
PARAMETER_NEW_VALUE="http://localhost/FF_DB"

Initial data in config file :

Code:

[nodes]
# You must set this to your client-visible server URL.
# fallback_node = http://example.com/path/to/sync

Data after running sed command :

Code:

[nodes]
# You must set this to your client-visible server URL.
# fallback_node = http://example.com/path/to/sync
fallback_node = http://localhost/FF_DB

Good.
Now editing the config file with some other data and we get :

Code:

[nodes]
# You must set this to your client-visible server URL.
# fallback_node = http://example.com/path/to/sync
fallback_node = http://localhost/OTHER_TEST

Data after running sed command :

Code:

[nodes]
# You must set this to your client-visible server URL.
# fallback_node = http://example.com/path/to/sync
fallback_node = http://localhost/FF_DB
# fallback_node = http://localhost/OTHER_TEST
fallback_node = http://localhost/FF_DB

Something like :
1�) Add new line with new parameter after the 1st line which is commeted out when token is encounted
2�) comment out line with actual parameter the 1st line which is not commeted out when token is encounted
3�)1�) Add new line with new parameter after the next line which is commeted out when token is encounted

Any help is welcome

jcdole

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