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for any escape code at 3rd line, 2nd column..
# sed '3s|\E\[[0-9][0-9]*;[0-9][0-9]*m|E[5;47m|2' infile
\E[0;40m \E[0;40m \E[0;40m \E[0;40m
\E[0;40m \E[0;40m \E[0;40m \E[0;40m
\E[0;40m \E[5;47m...

sed '3s/[^ ]*/\\E[5;47m/2' infile
sed "3s/[^ ]*/\\\E[5;47m/2" infile

row=3;col=5;
sed "$row s/\(..\)40m /\145m /$col" input_file


--ahamed

Which would mean the fourth column if all columns are only one character wide.

oh man!!!... ;)

--ahamed