1. The following example creates a list of all words in file1
one per line in file2, where a word is taken to be a maximal
string of letters.
tr -cs "[:alpha:]" "[\n*]" <file1 >file2
2. The next example translates all lowercase characters in file1
to uppercase and writes the results to standard output.
tr "[:lower:]" "[:upper:]" <file1
3. This example uses an equivalence class to identify accented
variants of the base character 'e' in file1, which are
stripped of diacritical marks and written to file2.
tr "[=e=]" "[e*]" <file1 >file2
