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UNIX - File/Table/Data manipulation

 
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# 1  
Old 09-21-2009
UNIX - File/Table/Data manipulation
Hi,

I have a table (e.g.):

a 1 e 4 5 6
b 2 r 4 4 2
c 5 r 3 7 1
d 9 t 4 4 9
.
.

What I need to do is to set the values of some values in column 2 to negative values. For example, the values 2 and 9 should become -2 and -9 in the modified file. How should I go about doing this?

Also, what would be a good websource or text book for file/data manipulation in UNIX? I may need to do more complex things and would like to do them on my own. Smilie

many thanks!
# 2  
Old 09-21-2009
How would you determine which row's column 2 should be 'negated' or not?
# 3  
Old 09-21-2009
It would be read in from another file, for example, the other file would contain the values '2' and '9'.
 
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