Many people use external commands such as tr and awk for
uppercasing and lowercasing strings, but this is not necessary. BASH 4
and later can do this all by itself.
To upper case
jira_key=foo-2343
printf "%s\n" ${jira_key^^}
Result:
FOO-2343
To lower case
jira_key=FOO-2343
printf "%s\n" ${jira_key,,}
Result:
foo-2343
