Translates characters from the standard input to the standard output. There are two differences between /usr/bin/tr and this version:
In SunOS 4.1, when translating from string1 to string2, if string2 is shorter than string1, string2 is padded out to the length of string1 by repeating string2's last character.
This version does not require enclosing alphanumeric ranges inside square brackets.