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translate text (1 position) with sed

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# 1  
Old 12-11-2003
translate text (1 position) with sed
Hello,

I'm trying to translate a fixed length (the first 6 positions) that begins with a 0 to overwrite the field with an *.

Any suggestion?

File 1
-------

013344 01:20
222343 19:30
233333 20:30


File 2 (result)
-----------------

****** 01:20
222343 19:30
233333 20:30
# 2  
Old 12-11-2003
sed 's/^....../******/' file1 > file2
# 3  
Old 12-11-2003
Ygor's solution will change the first 6 positions of every line in the file. I think the OP only wants the the first 6 positions of line 1 changed. If so:

sed '1s/^....../******/' file1 > file2
# 4  
Old 12-11-2003
"that begins with a 0"

i guess it should be

sed 's/^0...../******/' file1 > file2
# 5  
Old 12-11-2003
If you want to match the field only that contains digits only, then:

sed 's/^0[0-9]\{5\} /****** /' file1 > file2

It matchs the field starting with 0 and 5 digits follow it. I added one more space in both of pattern and replacement for more accuracy.
# 6  
Old 12-12-2003
Thank you for the solutions, it works great!
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