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Replace 8th and 9th characters in file permanently

 
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# 1  
Old 11-02-2011
Replace 8th and 9th characters in file permanently
Good evening,

I have a file and wish to replace the 8th and 9th characters on the first line only no matter what they are with 44 and the file permanantly changed.

e.g. file example.txt before change:

123456789123456
hi how are you
blah
blah


file example.txt after change:

123456744123456
hi how are you
blah
blah


All answers much appreciated.
# 2  
Old 11-02-2011
Try:
Code:
perl -i -pe 's/(.{7})../${1}44/ if $.==1' example.txt

This User Gave Thanks to bartus11 For This Post:
GarciasMuffin
# 3  
Old 11-03-2011
Works perfectly.

Many thanks.

---------- Post updated 11-03-11 at 04:11 AM ---------- Previous update was 11-02-11 at 06:36 PM ----------

Morning,


I have now been asked for it in a bash script.

No perl.



Any ideas

Thanks in advance.
# 4  
Old 11-03-2011
Code:
 
$ sed  '1 s/\(.......\)..\(.*\)/\144\2/' test 
123456744123456
hi how are you
blah
blah

---------- Post updated at 03:10 PM ---------- Previous update was at 03:09 PM ----------

Code:
 
$ sed '1 s/\(.\{7\}\)../\144/' test
123456744123456
hi how are you
blah
blah

# 5  
Old 11-03-2011
If your file is big, the following will take no time:
Code:
echo 44 |dd of=test bs=1 seek=7 count=2 conv=notrunc

 
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