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# 8  
Old 11-07-2005
OK, I understand the idea. Is there a way for me to use the record number that was previously entered by the user (the code in my last post)?


Here's what I just tried, but it completely overwrote the file with a blank file.
Code:
sed -e '${number}d' phonebook > tmp
mv temp phonebook
chmod 755 phonebook

I would like to completely remove the record and put the new data in its place.

Thanks,
Eric
# 9  
Old 11-07-2005
Quote:
Originally Posted by ericelysia
Code:
sed -e '${number}d' phonebook > tmp
mv temp phonebook
chmod 755 phonebook

I dont know whether the >tmp is typo in the post or you actually did it.

Or did you mean mv tmp phonebook ?

And why the chmod ?

vino
# 10  
Old 11-07-2005
Yes, that was a typo.

I used chmod before when removing records, so I was under the impression that it would be similar.

Eric
# 11  
Old 11-07-2005
So I gather that you still have the problem.

It could be with the quotes you are using.

Try

Code:
sed -e "${number}d" phonebook > tmp

From man sh

Code:
       Enclosing  characters  in  single quotes preserves the literal value of
       each character within the quotes.  A single quote may not occur between
       single quotes, even when preceded by a backslash.

       Enclosing  characters  in  double quotes preserves the literal value of
       all characters within the quotes, with the exception of $,  `,  and  \.
       The  characters  $  and  `  retain  their special meaning within double
       quotes.  The backslash retains its special meaning only  when  followed
       by one of the following characters: $, `, ", \, or <newline>.  A double
       quote may be quoted within double quotes by preceding it with  a  back-
       slash.

vino
# 12  
Old 11-08-2005
The following does work:
Code:
# Remove the record with the record number using sed.
sed -e "${number}d" phonebook > tmp
mv tmp phonebook
chmod 755 phonebook


# Add the fields back into the file.
echo "$name:$address:$city:$state:$zipCode:$phoneNumber" >> phonebook


Is the original record that I remove is record 33, is there a way to add the fields back into the file as record 33?

The changed record is getting appended to the end of the file.

Thanks,
Eric
# 13  
Old 11-08-2005
If the record number is 33

Code:
sed -n -e '1,32p' phonebook > tmp
echo "Record # 33" >> tmp
sed -n -e '33,$p' phonebook >> tmp

mv tmp phonebook

# 14  
Old 11-08-2005
Is there a way to use the record number that is input by the user?

I initially was thinking:

Code:
sed -n -e '1,${number - 1}p' phonebook > tmp

But I am thinking this works like C++ or Java. I assume this is not right, because I do not see any arithmetic commands in this book that I have.

Thanks,
Eric
 
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