Shell Programming and Scripting

Hello,
I need to use sed to find a certain string and then do a replace on the line above. For example if I had the following text:

Code:

AAAAAAA
BBBBBBB
CCCCCCC
DDDDDD

I would like to find CCCCCCC, but I would like the replace to be carried out on BBBBBBB. I have done some searching and can only find instructions on deleting and inserting on lines other than the ones for which you are matching.

Do I need a delete and then a second sed for an insert or can it all be done in one sed?

Any suggestion welecome!

What is your search pattern? BBBB? Give a more realistic sample input and expected output...

--ahamed

Ok, say I have this piece of XML:

Code:

<TERM>
<PARAM NAME="DATACENTER” OP="EQ"
VALUE="Data1"/>
<PARAM NAME="GROUP” OP="EQ” VALUE="GRP_04"/>
</TERM>
</TERMS>

I need to find <PARAM NAME="GROUP” OP="EQ” VALUE="GRP_04"/>

but update VALUE="Data1"/> (i.e. the line above)

I specifically have to only have to update:

VALUE="Data1"/> when it is followed by <PARAM NAME="GROUP” OP="EQ” VALUE="GRP_04"/>
, because there are many instances of VALUE="Data1"/> that I do want to update in the XML, does that make sense?

in short I need to have a command to replace the line above my search string

Try this...

Code:

awk '/VALUE="Data1"\/>/{x=$0;getline;if($0~srch){print "whatever you want"}else{print x}}1' 
srch='<PARAM NAME="GROUP” OP="EQ” VALUE="GRP_04"/>' input_file

--ahamed

Hello - thanks that works for the specific example. However I probably should have explained that the value above won't alway be:

Code:

VALUE="Data1"/>

it could be anything. That is why I want to search on:

Code:

<PARAM NAME="GROUP” OP="EQ” VALUE="GRP_04"/>

and replace the line above whatever it is.

Any further suggestions? Thanks

Try:

Code:

awk '{if(/CCCCCCC/)print t;else if(p)print p;p=$0}END{print p}' t=XXX infile

Scrutinizer, thats perfect thank you. ahamed101 thanks for some good input.