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Editing part of the string

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# 1  
Old 07-25-2011
Editing part of the string
Hi guys got a problem here hope u all can help me. I learn that sed can actually edit a string but you need to know the old attribute to change to new 1.
Example:
Code:
 sed "s/$title:$author/$title:$Nauthor/g"

Code:
"Harry Potter - The Half Blood Prince:J.K Rowling:40.30:10:50"

Each delimiter : represent 1 new attribute.
can i change 40.30 without knowing it 40.30 but using it position to change??
Last edited by radoulov; 07-25-2011 at 10:47 AM.. Reason: Code tags.
# 2  
Old 07-25-2011
From BookDB.txt? ))) This is at least the third question for the last two days.
Quote:
can i change 40.30 without knowing it 40.30 but using it position to change??
Yes, you can. If you will study good. Smilie
# 3  
Old 07-25-2011
Is it? =.= but my shell coding one/two day lesson only then assignment came!! i try my very best to learn from google.com but really cannot solve this part =( help pls !!
# 4  
Old 07-25-2011
From the command line:
Code:
$ awk -v var="YOUR PRICE" '
BEGIN { FS=OFS=":" }  
/^Harry Potter/ { $3=var }
{ print }
'  BookDB.txt

But please don't ask me how this works.
Or with sed:
Code:
$ var="YOUR PRICE"; sed -n '/^Harry Potter/s/[^:]*:/'"$var"':/3p' BookDB.txt

Last edited by yazu; 07-25-2011 at 11:22 AM.. Reason: sed variant
# 5  
Old 07-25-2011
Thank!! i will go google and learn what each symbol mean
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