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Search text and append using SED?

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# 1  
Old 07-23-2012
Search text and append using SED?
I have file .
cat hello.txt
Code:
Hello World

I would like to append a string "Today " so the output is
cat hello.txt
Code:
Hello World Today

I dont know which line number does the "Hello World" appears otherwise I could have used the Line number to search and append .
# 2  
Old 07-24-2012
You could use "Hello World" as a pattern to search instead of the line number. Hope you'll find out how this type of addressing is done using the man pages of your tool.
# 3  
Old 07-24-2012
In sed:

Code:
sed '/Hello World/ !b; s/$/ Today/'

Will append " Today" to the end of every line that contains "Hello World.'

The sed programme works by searching each record for the string "Hello World". The !b causes the programme to branch to the end if the string is not matched. Otherwise the end of the line ($) is replaced (substitution command s/exp/replacement/) with " Today." The end of the programme is naturally reached after the substitution and the record is printed.
# 4  
Old 07-24-2012
try this!!
Code:
sed 's/Hello World/& Today/g'

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