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Thanks DG... it worked

Hi,
I'm looking for a way (other than C) to pull out a number of bytes in a Linux file for a giving length. for example:

file1 contains 2 records:
abcdefghijkl
mnopqrstuv
.....
so, I want to...

Thanks everyone for your suggestions... all of them worked

I have a file that I need to count the number of "Y"s in the file, but just the "Y"s that fall between certain columns. Like:

file1:
1234567890123456789012345
BBBBBBYBBBBYBBYBBYBBYBBB

I...

Thank Guys! I'm doing some testing. Looks like it works for the first occurance in the file when the cnt=0, but when I change the... if cnt=="1" then the second does not get change... I'll do more...

If anyone knows why $cc is ignored in the following awk.
When I use a value it works ok.
cc=`grep -a "ControlID" in.file | cut -c 375-378`

$cc is equal to "XXXX"

does not work:
cat...

no error messages. nothing happens, looks like it can't find 'Control ID".

When I run this on a small file it works. Could be end of line characters.. not sure.

Background:
This is a AFP file...

Thanks Scott! that worked..

---------- Post updated at 11:12 AM ---------- Previous update was at 09:26 AM ----------

when I try to run this on my production file it does not work. I think it's...

Scott,

the command works ok, but 1 space replaces 4 bytes which compresses the file:

sed "s/\(.*\)....\(.\{7\}Control ID.*\)/\1 \2/"

In:
abcde****1234567Control ID890

to:
abcde...

thanks a lot..

I'm new to Unix scripting and I'm not sure if this can be done. Example:

search (grep) in a file for 'Control ID' and then replace with 4 blanks 7 bytes before 'Control ID.

input...