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Image to text converter.
Convert your scanned book in image format like .png, .jpg into editable text format.
OCR ==> Optical Code Reader
http://manpages.ubuntu.com/manpages/hardy/man1/icotool.1.html
There is also wrestool command.
There is a common command for outputting a field or list of fields from each line in a file. Why wouldn't you just use cut?
The above is an example of grabbing only the first column. You can define the start and end points specifically by chacater position using the following command:
while read l; do echo ${l:10:40}; done < three-column-list.txt > column-c10-c40.txt
Of course, it doesn't have to be a column, or extraction, it can be replacement
while read l; do echo ${l/foo/bar}; done < list-with-foo.txt > list-with-bar.txt
Read more about parameter expansion here:
http://wiki.bash-hackers.org/syntax/pe
Think of this as an alternative to awk or sed for file operations
wrestool can be found in icoutils (http://www.nongnu.org/icoutils)