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