1 2v=abcd 3[ "${#v}" = 4 ] || echo '${#v} wrong' 4v=$$ 5[ "${#$}" = "${#v}" ] || echo '${#$} wrong' 6[ "${#!}" = 0 ] || echo '${#!} wrong' 7set -- 01 2 3 4 5 6 7 8 9 10 11 12 0013 8[ "${#1}" = 2 ] || echo '${#1} wrong' 9[ "${#13}" = 4 ] || echo '${#13} wrong' 10v=$0 11[ "${#0}" = "${#v}" ] || echo '${#0} wrong' 12