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Paste value at specific column using sed

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# 1  
Old 12-01-2009
Paste value at specific column using sed
Hi

I want to paste some value at specific column in a file using sed.
say I want to add "Welcome to UNIX" from column 300 onwards in a file using sed.

How to do it .

---------- Post updated at 11:18 AM ---------- Previous update was at 11:09 AM ----------

Adding more information :
I am using this command
Code:
sed "s/$/$var1$var2/g" $FILE

However it is appending at the end of each line.
I want to append it from column 300 onwards.

Instead of $ can I specify column from which I want.
# 2  
Old 12-01-2009
Code:
 $sed "s/.\{300\}/&Welcome to UNIX/g" FILE

# 3  
Old 12-01-2009
Hi
Thanks for your reply.

I am trying this :
Code:
sed "s/.\{300\}/$var1$var2/g" $FILE

However , it is not working.
It is giving error :

Code:
sed: Function s/.\{300\}/100200/g cannot be parsed.

# 4  
Old 12-01-2009
Code:
I tried like this, 

## Sample file
$ cat a
12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890

$ cat t.sh

var1=100
var2=200

sed "s/.\{300\}/&$var1$var2/g" a

## see 100200 in output

$sh t.sh
12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789010020012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890

# 5  
Old 12-01-2009
If in my file data is till 280 column only and I want to add content at 300 column .
Will this still work ?
# 6  
Old 12-01-2009
make clear definition of the word column. column to some may mean fields delimited by some character(s). ie, field 300. Or are you talking about "character position 300 onwards" ?
# 7  
Old 12-01-2009
I mean character position 300 onwards...
And my file is having data only at 280 character position.
I want to add values from 300 character position onwards.

I am trying this :
Code:
sed "s/.\{300\}/$var1$var2/g" $FILE

However it is not working.
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