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updating a file with sed -help

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# 1  
Old 10-25-2011
updating a file with sed -help
I have a file of records all made up of single charactors that need to be updated using their row/column

(the dashes represent spaces as the html formatting of this text box when it posts removes the "nonessential" white space between the charactors)

file example
Code:
A  1  c
B  2  b
C  3  a

to change row 2, column 2 to "5" would look something like this correct?

Code:
sed -i -e '2s/?/5/2' FILENAME

two questions: What would I have to put in the "find" section to correctly replace a non-blank charactor with the "replace" section and how could I pass variables into each of the R/C/replace sections as
Code:
sed -i -e "$Rs/?/$U/$C" FILENAME

doesnt work
Moderator's Comments:
Mod Comment
Please use code tags when posting data and code samples!
Last edited by vgersh99; 10-25-2011 at 12:25 PM.. Reason: code tags, please!
# 2  
Old 10-25-2011
what is 'blank'? [ ]
what is 'non-blank'? [^ ]
Code:
sed -i -e '2s/[^ ]/5/2' FILENAME

# 3  
Old 10-25-2011
Thank you, thats exactly what I was looking for
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