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Deleting/Removing sentence from .txt

 
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# 1  
Old 01-30-2011
Deleting/Removing sentence from .txt
Hi,

now i need to remove the entires i inserted into my .txt file.

Code:
    echo -n "Title: "
    read Title
    echo -n "Author: "
    read Author
    if grep -q "$Title: $Author" "BookDB.txt"; then
	sed '$Title: $Author' BookDB.txt
	echo "Book Title '$Title' removed successfully!"		
    else
	echo "Error! Book does not exists!"
    fi

my sed command doesnt seems to work. my BookDB.txt contains the Title, Author and price of the book. Required to delete the whole sentence just by the input of Title and Author.

For E.g

ABC:John:5

where ABC = Title, John = Author, 5 = Price.

Much help would be appreciated =)
Last edited by Yogesh Sawant; 01-30-2011 at 05:30 PM.. Reason: added code tags
# 2  
Old 01-30-2011
Have a look at: grep -v
# 3  
Old 01-30-2011
Quote:
Originally Posted by Scrutinizer
Have a look at: grep -v
i need to remove the line permanently instead of prnting the non matching lines.
# 4  
Old 01-30-2011
You can direct it to a new file and then replace the original with it...
# 5  
Old 01-30-2011
meaning? can i code it in a way that it remove the sentence straight from the BookDB.txt itself instead of creating a new file to replace it?

---------- Post updated at 04:45 PM ---------- Previous update was at 04:35 PM ----------

sed "/$Title/d" BookDB.txt > BookDB1.txt

i did this for a new file. but how do i direct it back to BookDB.txt itself instead of BookDB1.txt which is a temporary file.
# 6  
Old 01-30-2011
Code:
sed "/$Title/d" BookDB.txt > BookDB1.txt && mv BookDB1.txt BookDB.txt

If you have GNU sed you can do an in place edit:
Code:
sed -i.bak "/$Title: $Author/d" BookDB.txt

This User Gave Thanks to Scrutinizer For This Post:
santonio
# 7  
Old 01-30-2011
Thanks! PRoblems solved!

sed "/$Title/d" BookDB.txt > BookDB1.txt && mv BookDB1.txt BookDB.txt does the trick! =)
 
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