C:\>perl -e "print (a..z,A..Z,0..9)"
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789
C:\>perl -we "print (a..z,A..Z,0..9)"
print (...) interpreted as function at -e line 1.
Unquoted string "a" may clash with future reserved word at -e line 1.
Unquoted string "z" may clash with future reserved word at -e line 1.
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789
C:\>perl -we "print join'',('a'..'z',A..Z,0..9)"
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789
C:\>