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File pattern changing

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# 1  
Old 10-12-2012
File pattern changing
Hello All,

I have a file say

Code:
cat test.txt
sathya sxk opt
Sandy   sxr omg
Ram rxm opt

Now I would like to change opt to omr only for the line in my file
sathya sxk opt

How can i do it.

I know we can do it with sed -i option, but its not present in my system, please help me some solution.
# 2  
Old 10-12-2012
Code:
perl -i.bak -pe 's/opt/omr/ if /sathya/' test.txt

# 3  
Old 10-12-2012
Code:
 
awk '/sathya.*opt/{gsub("opt","omr")}1' input.txt > output.txt

# 4  
Old 10-12-2012
ah thanks for the Quick response.
@Elixir: can you please tel me what is -i.bak

@itkamaraj : Here I want to make the changes in the same file. input.txt, output.txt will not work out for me. so can I accomplish it.
# 5  
Old 10-12-2012
-i.bak (inline edit) is for taking backup of your orginal file and apply the changes in your original file itself.
# 6  
Old 10-12-2012
Code:
# cat test.txt
sathya sxk 123
Sandy   sxr omg
Ram rxm opt


#  perl -i.bak -pe 's/123/S@THYA01/ if /sathya/' test.txt
# cat test.txt
sathya sxk S
Sandy   sxr omg
Ram rxm opt

Will this not work Properly if special characters are in place ?
May be we have to give \ before that.

JFYI: I will be using variables in my Script for 123 and S@THYA01, so do I have to make any changes in this PERL command for that ?
or perl -i.bak -pe 's/$var1/$var2/ if /$name/' test.txt will work without any changes to it.
# 7  
Old 10-12-2012
when you are using @, perl think it is an array.

why dont and let us know, as you suggested.
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