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another option:
typeset -L9 a
a=<the number>

your description is too vague to translate into code segment. You'd better describe in details how you gonna check the first two columns before others can post the solution;)

your guess about the [] is correct. and the $ represents the end of the line.

If all the characters before the comma(,) are all digits, then you can do this by running the following command:
sed 's/^\([0-9][0-9]*\)/\1,/' a

or, your sed command can be revised to the following:
echo $path | sed 's/\/[^\/]*txt$//'