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shell script to mask

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# 1  
Old 08-26-2008
shell script to mask
I have a file which has huge number of rows.

I have to mask only few rows at a particular position lets say 12th to 19th i have to replace with X's (XXXXXXX)

I am reading the file and even checking the conditions, but I am not sure how I can replace the text

my program

while read lines
do
b=`echo "$lines" | awk '{print substr($0,1,3)}'`
if [ "$b" = "0 " ]; then
?????????????????????
fi
done < maintest


maintest is my file

I dont want to create a temp file and place all the lines in it .


Please help
thanks

# 2  
Old 08-26-2008
Code:
awk '$12=$19="XXX"' file > new_file

# 3  
Old 08-26-2008
Can it be done without using a new_file ?

I mean updating the same file is that possible?

Please Advice

Thanks
# 4  
Old 08-26-2008
A suffiently big file, not very well.

Unless you did it in C - and use the rewrite command. This will work only if the new data is the same size as the old.

Perhaps a C class would be the way to go.

Quote:
Originally Posted by prassu
Can it be done without using a new_file ?

I mean updating the same file is that possible?

Please Advice

Thanks
# 5  
Old 08-26-2008
thanks for your update,

I would probably do this for now
read every line paste it in the new file if it doesn't match with my conditions.

if it does match paste the $line | awk command into the file

Thanks and really appreciate the timely responses.
# 6  
Old 08-26-2008
Quote:
Originally Posted by prassu
Can it be done without using a new_file ?

I mean updating the same file is that possible?

Please Advice

Thanks
With GNU sed you can uptate file in place using the -i option.
Code:
> cat prassu.dat
123456789012345678901234567890
----.----+----.----+----.----+
abcdefghijklmnopqrstuvwxyz____
> sed -i 's/\(.\{15\}\)..../\1XXXX/' prassu.dat
> cat prassu.dat
123456789012345XXXX01234567890
----.----+----.XXXX+----.----+
abcdefghijklmnoXXXXtuvwxyz____
>

Jean-Pierre.
# 7  
Old 08-27-2008
Unfortuantely,
I am not able to use the sed -i but

I am also getting error while using the following command
$lines has the string I want to modify

write=`echo "$lines" | awk '$12=$19="XXX"'`
echo "$write" | cat >>test

Am I doing right ?

I even tried this.

write=`echo "$lines" | awk '{print substr($0,1,12) "XXXXXXX" substr($0,19)'`

Please suggest
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