Bash: printing the alphabet

(Sorry for the geeky topic, non-geeky readers)

Most have probably run across the "seq" command that will let you generate a list of numbers:

$ seq 1 4
1
2
3
4

But you can do similar with "echo" for a list of letters:

$ echo {a..d}
a b c d
$ echo {a..d}{a..d}
aa ab ac ad ba bb bc bd ca cb cc cd da db dc dd