1--- 2layout: docs 3page_title: upper - Functions - Configuration Language 4description: >- 5 The upper function converts all cased letters in the given string to 6 uppercase. 7--- 8 9# `upper` Function 10 11`upper` converts all cased letters in the given string to uppercase. 12 13## Examples 14 15```shell-session 16> upper("hello") 17HELLO 18> upper("алло!") 19АЛЛО! 20``` 21 22This function uses Unicode's definition of letters and of upper- and lowercase. 23 24## Related Functions 25 26- [`lower`](/docs/job-specification/hcl2/functions/string/lower) converts letters in a string to _lowercase_. 27- [`title`](/docs/job-specification/hcl2/functions/string/title) converts the first letter of each word in a string to uppercase. 28