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Reading a file and replacing char by position

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# 1  
Old 04-19-2011
Reading a file and replacing char by position
Hi
I'm looking for a way to read a text file that may contain 1000 records or more and each of these records has 460 characters. I need to read each record, and add a string of characters starting at position 256 for each record. Any suggestions using UNIX shell scripting.
# 2  
Old 04-19-2011
See if this works for you:
Code:
sed 's/.\{255\}/&YourString/' Inp_File

# 3  
Old 04-19-2011
Awesome! Thanks Shell_Life, one thing though as I inserted these 4 characters my data shifted to the right 4 spaces. Anyway to do this without shifting the data over??
# 4  
Old 04-19-2011
You asked to add/insert a string, this way the original data is incremented by the string and thus shifted.

If you do not want to have the data shifted, then you want to replace:
Code:
sed 's/\(.\{255\}\)..../\1ABCD/' Inp_File

This User Gave Thanks to Shell_Life For This Post:
macastor
# 5  
Old 04-19-2011
Awesome!!! Thank you very much Shell_Life, that worked like a champ. Smilie
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