This is an excellent article. However, note that if you're using tr from GNU Coreutils, you have to use the 'A-Za-z' syntax for character ranges instead of '[A

This is an excellent article. However, note that if you're using tr from GNU Coreutils, you have to use the 'A-Za-z' syntax for character ranges instead of '[A-Z][a-z]', since GNU tr doesn't use the SysV syntax [1]: GNU `tr' does not support the System V syntax that uses square brackets to enclose ranges. Translations specified in that format sometimes work as expected, since the brackets are often transliterated to themselves. However, they should be avoided because they sometimes behave unexpectedly. For example, `tr -d '[0-9]'' deletes brackets as well as digits. [1]: https://www.gnu.org/software/coreutils/manual/html_node/Character-sets.html https://www.gnu.org/software/coreutils/manual/html_node/Char...