ccollate is a command within the Tclx package.

ccollate ?-local? string1 string2

This command compares two strings. It returns -1 if string1 is less than string2, 0 if they are equal and 1 if string1 is greater than string2.

If -local is specified, the strings are compared according to the collation environment of the current locale.

---

This command at one point did not work with binary or UTF data.

If locale-aware processing is not required, consider using string compare.

---