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Linux: replace pattern with pattern

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# 1  
Old 10-09-2012
Linux: replace pattern with pattern
Hi, I am a rookie of Linux.
I have a problem on how can I replace a certain pattern in Linux with nothing. Can anyone help me?Smilie

sample.txt:
Code:
<binding>App189
ABC SampleMachine1 ABC
XXX
YYY
ZZZ
</binding>
<binding>App190
ABC SampleMachine2 ABC
XXX
YYY
ZZZ
</binding>
<binding>App191
GHI SampleMachine3 ABC
XXX
YYY
ZZZ
</binding>

What I need to do is to search a keyword like "SampleMachine2" in 'sample.txt', and then delete its whole binding. I think the pattern should be like:
Code:
<binding> *
* SampleMachine2 *
*
</binding>

My desired result after delete is that:
Code:
<binding>App189
ABC SampleMachine1 ABC
XXX
YYY
ZZZ
</binding>
<binding>App191
GHI SampleMachine3 ABC
XXX
YYY
ZZZ
</binding>

Could anyone tell me what should be the script like?

Moderator's Comments:
Mod Comment Please use code tags
Last edited by Scrutinizer; 10-10-2012 at 03:59 AM.. Reason: ; code tags (mod)
# 2  
Old 10-10-2012
This will work on your input sample:
Code:
sed -n 'H
/<\/binding>[ \t]*$/{
s/.*//
x
s/^\n//
/ SampleMachine2 /!p
}' file

This User Gave Thanks to elixir_sinari For This Post:
dirkaulo
# 3  
Old 10-10-2012
Thanks! I have tried it. It works, but it only print out the result.
If I want to change the original text file (sample.txt) as well, how should I change the command?
# 4  
Old 10-10-2012
Redirect output to a temp file, check whether the editing is satisfactory, and then rename the temp file to the original file.
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