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Is the dot to be included? Try pure bash:var=./dir1/file1/abc.sh
echo ${var%/*}
./dir1/file1

many ways to skin that cat:

echo './dir1/file1/abc.sh' | sed 's#/[^/][^/]*$##'

wc -c, not wc -m. For ASCII text, you want bytes. The difference is small but important.

wc will include the line feed in the length, yes.

That's pretty close, really.

Use wc -c to print the number of characters instead of lines.