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 !=.