Shell Programming and Scripting

Hi era / Scripting experts

I still help to know how to reverse the process..

Thanks in advance

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It would be easier if the comment could go after the DISABLE line; is this an option?

Code:

sed '/host=atlx3 sid=atld3/{;h;s/mail=.*/mail=DISABLE/p;x;s/^/#/;}' abc.txt

to disable and

Code:

sed '/mail=DISABLE$/{;N;s/.*\n#//;}' abc.txt

to enable again (assuming your sed understands \n).

Code:

cat filename | sed '/host=atlx3 sid=atld3/p' | awk 'BEGIN{n=0}
{
if (index($0,"host=atlx3 sid=atld3")!=0 && n==0)
{
        print "#"$0
	n=1
}
else
	print
}'

Yes, the comment could go after the DISABLE line but in the second part of the sed command if there are multiple entries with comment '#' and DISABLE THEN I want to un-comment and delete the DISABLE line based on certain host and sid.

for example:
**********
--- start of abc.txt ----
host=atlx1 sid=atld1 mail=abc@abc.com
host=atlx2 sid=atld2 mail=xyz@abc.com
host=atlx3 sid=atld3 mail=def@abc.com
host=atlx4 sid=atld4 mail=mno@abc.com
------- end of abc.txt --------

Then I issue the command

sed '/host=atlx3 sid=atld3/{;h;s/mail=.*/mail=DISABLE/p;x;s/^/#/;}' abc.txt

then I issue the command for another host and sid

sed '/host=atlx4 sid=atld4/{;h;s/mail=.*/mail=DISABLE/p;x;s/^/#/;}' abc.txt

after issuing the above two commands, here's the NEW abc.txt file

----- start of NEW abc.txt ----
host=atlx1 sid=atld1 mail=abc@abc.com
host=atlx2 sid=atld2 mail=xyz@abc.com
host=atlx3 sid=atld3 mail=DISABLE
#host=atlx3 sid=atld3 mail=def@abc.com
host=atlx4 sid=atld4 mail=DISABLE
#host=atlx4 sid=atld4 mail=mno@abc.com
------ end of NEW abc.txt -------

NOW I want to uncomment the entry for host=atlx3 sid=atld3 and remove the line with host=atlx3 sid=atld3 and mail=DISABLE.

Hope I am clear with my requirement.

Again THANK YOU so much for your help.

Code:

sed '/host=atlx3 sid=atld3 mail=DISABLE$/{;N;s/.*\n#//;}' abc.txt

Thanks era, it works but there are still some issues.

if there's more than one blank space between host and sid then it does not work AND also if there are more than one line with the same host and sid it comments '#' all lines having the given host, sid.

for example
*********

----- abc.txt -----
host=atlx1 sid=atld1 mail=abc@abc.com
host=atlx2 sid=atld2 mail=xyz@abc.com
host=atlx3 sid=atld3 purpose=development
host=atlx3 sid=atld3 mail=def@abc.com
host=atlx4 sid=atld4 mail=mno@abc.com
---- end of abc.txt ----

by running the command ....

sed '/host=atlx3 sid=atld3/{;h;s/mail=.*/mail=DISABLE/p;x;s/^/#/;}' abc.txt

it gives the following output...

host=atlx1 sid=atld1 mail=abc@abc.com
host=atlx2 sid=atld2 mail=xyz@abc.com
#host=atlx3 sid=atld3 purpose=development
host=atlx3 sid=atld3 mail=DISABLE
#host=atlx3 sid=atld3 mail=def@abc.com
host=atlx4 sid=atld4 mail=mno@abc.com

it should not comment '#' the line shown in red above (with purpose=development)


Again Thank You so much for your help, without your help I would still be reading the man pages....