Infix operator for string comparison inside expr. Returns true if its arguments are not string-equal.
Its opposite part is eq which returns true if its arguments are string-equal.
Differs from != in such that its arguments cannot be treated as numerical values, so 1 != 1.0 returns false, but 1 ne 1.0 returns true.
Example:
% expr {"a" eq "b"}
0
% expr {"a" ne "b"}
1
%Also comparing text with ne is faster than !=.