Search and replace

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# 8  
Old 09-21-2009
So just remove the <> from my code. If you really want to specify there only one hyphen, then consider the following command:
sed -re 's/^(ACTIVATION CODE=)[[:alnum:]]+-[[:alnum:]]+$/\1the_new_number/' /path/to/the/file

# 9  
Old 09-21-2009
permanent change

Is the search and replace by sed permanent or that i need to redirect to another file

---------- Post updated at 04:13 AM ---------- Previous update was at 04:08 AM ----------

I have a variable called VAR which contains the new activation code. I want to replace the existing activation code with that of the variable VAR
# 10  
Old 09-21-2009
The following command will permanently change the original file:
sed -ri 's/^(ACTIVATION CODE=)[[:alnum:]]+-[[:alnum:]]+$/\1'"$VAR/" /path/to/the/file

The following command will backup the original file (with extension .bak) and then permanently change it:
sed -ri.bak 's/^(ACTIVATION CODE=)[[:alnum:]]+-[[:alnum:]]+$/\1'"$VAR/" /path/to/the/file

The following command will not modify the original file but rather create a new modified file:
sed -r 's/^(ACTIVATION CODE=)[[:alnum:]]+-[[:alnum:]]+$/\1'"$VAR/" /path/to/the/file > /path/to/the/new/modified/file

---------- Post updated at 14:02 ---------- Previous update was at 12:32 ----------

Hi proactiveaditya,
Instead of creating new posts, it would be polite to at least tell if the given commands worked or not.
# 11  
Old 09-21-2009

Thanks Santiago
It worked
# 12  
Old 09-21-2009
Another approach:

awk -F= -v var=$VAR '/^ACTIVATION CODE/{$2=var}1' file > newfile

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